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Who said: “A change in motion is proportional to the motive force impressed and takes place along the straight line in which that force is impressed.”
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Walk Quotes (56 quotes)


...man will occasionally stumble over the truth, but usually manages to pick himself up, walk over or around it, and carry on.
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Question: If you walk on a dry path between two walls a few feet apart, you hear a musical note or “ring” at each footstep. Whence comes this?
Answer: This is similar to phosphorescent paint. Once any sound gets between two parallel reflectors or walls, it bounds from one to the other and never stops for a long time. Hence it is persistent, and when you walk between the walls you hear the sounds made by those who walked there before you. By following a muffin man down the passage within a short time you can hear most distinctly a musical note, or, as it is more properly termed in the question, a “ring” at every (other) step.
Genuine student answer* to an Acoustics, Light and Heat paper (1880), Science and Art Department, South Kensington, London, collected by Prof. Oliver Lodge. Quoted in Henry B. Wheatley, Literary Blunders (1893), 175-6, Question 2. (*From a collection in which Answers are not given verbatim et literatim, and some instances may combine several students' blunders.)
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Question: State what are the conditions favourable for the formation of dew. Describe an instrument for determining the dew point, and the method of using it.
Answer: This is easily proved from question 1. A body of gas as it ascends expands, cools, and deposits moisture; so if you walk up a hill the body of gas inside you expands, gives its heat to you, and deposits its moisture in the form of dew or common sweat. Hence these are the favourable conditions; and moreover it explains why you get warm by ascending a hill, in opposition to the well-known law of the Conservation of Energy.
Genuine student answer* to an Acoustics, Light and Heat paper (1880), Science and Art Department, South Kensington, London, collected by Prof. Oliver Lodge. Quoted in Henry B. Wheatley, Literary Blunders (1893), 179, Question 12. (*From a collection in which Answers are not given verbatim et literatim, and some instances may combine several students' blunders.)
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[Interviewer: If the building you are in now started to shake and you knew an earthquake was occurring, what would you do?]
I would walk - not run - to the nearest seismograph.
From interview in the Earthquake Information Bulletin (Jul-Aug 1971), 3, No. 4, as abridged in article on USGS website.
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A man, in his books, may be said to walk the earth a long time after he is gone.
John Muir
Quoted, without citation, in John Muir and Edwin Way Teale (ed.) The Wilderness World of John Muir (1954, 2001), Introduction, xx.
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A small cabin stands in the Glacier Peak Wilderness, about a hundred yards off a trail that crosses the Cascade Range. In midsummer, the cabin looked strange in the forest. It was only twelve feet square, but it rose fully two stories and then had a high and steeply peaked roof. From the ridge of the roof, moreover, a ten-foot pole stuck straight up. Tied to the top of the pole was a shovel. To hikers shedding their backpacks at the door of the cabin on a cold summer evening—as the five of us did—it was somewhat unnerving to look up and think of people walking around in snow perhaps thirty-five feet above, hunting for that shovel, then digging their way down to the threshold. [1971]
Encounters with the Archdruid
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All animals whatsoever, whether they fly or swim or walk upon dry land, whether they bring forth their young alive or in the egg, develop in the same way.
Aristotle
In The Works of Aristotle: Historia Animalium (350 BC), (The History of Animals), Book VII, Part 7, 586a21 translated in William David Ross and John Alexander Smith (eds.), D’Arcy Wentworth Thompson (trans.), (1910), Vol. 4, 27.
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As a single footstep will not make a path on the earth, so a single thought will not make a pathway in the mind. To make a deep physical path, we walk again and again. To make a deep mental path, we must think over and over the kind of thoughts we wish to dominate our lives.
From The Art of Living, Day by Day 91972), 77. Frequently misattributed to Henry David Thoreau.
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Experience hobbles progress and leads to abandonment of difficult problems; it encourages the initiated to walk on the shady side of the street in the direction of experiences that have been pleasant. Youth without experience attacks the unsolved problems which maturer age with experience avoids, and from the labors of youth comes progress. Youth has dreams and visions, and will not be denied.
From speech 'In the Time of Henry Jacob Bigelow', given to the Boston Surgical Society, Medalist Meeting (6 Jun 1921). Printed in Journal of the Medical Association (1921), 77, 599.
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Experimental physicists … walk a narrow path with pitfalls on either side. If we spend all our time developing equipment, we risk the appellation of “plumber,” and if we merely use the tools developed by others, we risk the censure of our peers for being parasitic.
In Nobel Lecture (11 Dec 1968), 'Recent Developments in Particle Physics', collected in Nobel Lectures: Physics 1963-1970 (1972), 241.
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Food production is now so energy-intensive that more carbon is emitted providing a person with enough calories to walk to the shops than a car would emit over the same distance.
Citing calculations made by environmentalist author, Chris Goodall.
'Walking to the shops damages planet more than going by car', in The Times (4 Aug 2007)
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From now on we live in a world where man has walked on the Moon. It’s not a miracle; we just decided to go.
Tom Hanks
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Generations to come, it may be, will scarcely believe that such a one as this ever in flesh and blood walked upon this earth.
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God is love… . We wouldn’t recognize that love. It might even look like hate. It would be enough to scare us—God’s love. It set fire to a bush in the desert, didn’t it, and smashed open graves and set the dead walking in the dark.
Quoted in Kim Lim (ed.), 1,001 Pearls of Spiritual Wisdom: Words to Enrich, Inspire, and Guide Your Life (2014), 143
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Gravity, a mere nuisance to Christian, was a terror to Pope, Pagan, and Despair. You can drop a mouse down a thousand-yard mine shaft; and, on arriving at the bottom, it gets a slight shock and walks away, provided that the ground is fairly soft. A rat is killed, a man is broken, a horse splashes.
Essay, 'On Being the Right Size', collected in Possible Worlds: And Other Essays (1927, 1945), 19. (Note: Christian appears in John Bunyan, Pilgrim’s Progress, in which Pope, Pagan and Despair are giants — Webmaster.)
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Great works are performed, not by strength, but by perserverance. He that shall walk, with vigour, three hours a day, will pass, in seven years, a space equal to the circumference of the globe.
As quoted, without citation, in John Walker, A Fork in the Road: Answers to Daily Dilemmas from the Teachings of Jesus Christ (2005), 179.
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Homo sapiens is a compulsive communicator. Look at the number of people you see walking around talking on mobile phones. We seem to have an infinite capacity for communicating and being communicated with. I’m not sure how admirable it is, but it certainly demonstrates that we are social organisms.
From interview with Michael Bond, 'It’s a Wonderful Life', New Scientist (14 Dec 2002), 176, No. 2373, 48.
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I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more, in proportion to the whole skeleton, than do the same bones in the wild duck; and this change may be safely attributed to the domestic duck flying much less, and walking more, than its wild parents.
From On the Origin of Species by Means of Natural Selection; or, The Preservation of Favoured Races in the Struggle for Life (1861), 17.
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I had at one time a very bad fever of which I almost died. In my fever I had a long consistent delirium. I dreamt that I was in Hell, and that Hell is a place full of all those happenings that are improbable but not impossible. The effects of this are curious. Some of the damned, when they first arrive below, imagine that they will beguile the tedium of eternity by games of cards. But they find this impossible, because, whenever a pack is shuffled, it comes out in perfect order, beginning with the Ace of Spades and ending with the King of Hearts. There is a special department of Hell for students of probability. In this department there are many typewriters and many monkeys. Every time that a monkey walks on a typewriter, it types by chance one of Shakespeare's sonnets. There is another place of torment for physicists. In this there are kettles and fires, but when the kettles are put on the fires, the water in them freezes. There are also stuffy rooms. But experience has taught the physicists never to open a window because, when they do, all the air rushes out and leaves the room a vacuum.
'The Metaphysician's Nightmare', Nightmares of Eminent Persons and Other Stories (1954), 38-9.
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I remember discussions with Bohr which went through many hours till very late at night and ended almost in despair; and when at the end of the discussion I went alone for a walk in the neighboring park I repeated to myself again and again the question: Can nature possibly be as absurd as it seemed to us in these atomic experiments?
In Physics and Philosophy: The Revolution in Modern Science (1958, 1962), 42.
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I sort of kept my hand in writing and went to work for the Sierra Club in ‘52, walked the plank there in ‘69, founded Friends of the Earth and the League of Conservation Voters after that.
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I then began to study arithmetical questions without any great apparent result, and without suspecting that they could have the least connexion with my previous researches. Disgusted at my want of success, I went away to spend a few days at the seaside, and thought of entirely different things. One day, as I was walking on the cliff, the idea came to me, again with the same characteristics of conciseness, suddenness, and immediate certainty, that arithmetical transformations of indefinite ternary quadratic forms are identical with those of non-Euclidian geometry.
Science and Method (1908), trans. Francis Maitland (1914), 53-4.
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I think the real miracle is not to walk either on water or in thin air, but to walk on earth.
Quoted in Kim Lim (ed.), 1,001 Pearls of Spiritual Wisdom: Words to Enrich, Inspire, and Guide Your Life (2014), 8
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I was a few miles south of Louisville when I planned my journey. I spread out my map under a tree and made up my mind to go through Kentucky, Tennessee, and Georgia to Florida, thence to Cuba, thence to some part of South America; but it will be only a hasty walk. I am thankful, however, for so much.
John Muir
Letter, written 'among the hills of Bear Creek, seven miles southeast of Burkesville, Kentucky'(Sep 1867). In John Muir and William Frederick Badé (Ed.), A Thousand-Mile Walk to the Gulf (1916), xix-xx. Illness, probably malarial, contracted in Florida caused him to cut short his plans in Cuba. Forty-four years passed before he made the journey to South America, in 1911.
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I would have picked up the artificial heart and thrown it on the floor and walked out and said he's dead if the press had not been there.
[Recalling moments of frustration caused by difficulties during the 7½-hour surgery on Barney Clark for the first human implant of an artificial heart.]
Quoted by Lawrence K. Altman in “Clark's Surgeon Was ‘Worried To Death’&rdquo, New York Times (12 Apr 1983), C1.
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If we walk in the woods, we must feed mosquitoes.
From 'Prudence', Essays, First Series (1847, 1869), 205.
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If you walked into Netscape headquarters with a plain old modem from CompUSA they’d think it was a garage-door opener.
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In a Dublin hospital, many years ago, it was noticed that the death-rate was markedly higher in the ground-floor wards than it was in the wards upstairs. This fact was commented on in an official report, and marked down as requiring investigation. Then it was discovered that, when new patients came in, the porter of the hospital was in the habit of putting them upstairs if they could walk by themselves, and downstairs if they could not.
From 'Figures Can Lie', Science Digest (Sep 1951), 30, No. 3, 53. (As condensed from The Listener). Excerpted in Meta Riley Emberger and Marian Ross Hall, Scientific Writing (1955), 407.
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In every walk with nature one receives far more than he seeks.
John Muir
Letter (Salt Lake, Jul 1877), in William Frederic Bade, Steep Trails (1918, 1994), 92.
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In our way of life … with every decision we make, we always keep in mind the seventh generation of children to come. … When we walk upon Mother Earth, we always plant our feet carefully, because we know that the faces of future generations are looking up at us from beneath the ground. We never forget them.
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John Muir quote Indians walk softly
Crescent Meadow in Sequoia National Park (source)
Indians walk softly and hurt the landscape hardly more than the birds and squirrels, and their brush and bark huts last hardly longer than those of wood rats, while their more enduring monuments, excepting those wrought on the forests by the fires they made to improve their hunting grounds, vanish in a few centuries.
John Muir
In My First Summer in the Sierra (1911), 73. Based on Muir’s original journals and sketches of his 1869 stay in the Sierra.
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Man … begins life as an ambiguous speck of matter which can in no way be distinguished from the original form of the lowest animal or plant. He next becomes a cell; his life is precisely that of the animalcule. Cells cluster round this primordial cell, and the man is so far advanced that he might be mistaken for an undeveloped oyster; he grows still more, and it is clear that he might even be a fish; he then passes into a stage which is common to all quadrupeds, and next assumes a form which can only belong to quadrupeds of the higher type. At last the hour of birth approaches; coiled within the dark womb he sits, the image of an ape; a caricature of the man that is to be. He is born, and for some time he walks only on all fours; he utters only inarticulate sounds; and even in his boyhood his fondness for climbing trees would seem to be a relic of the old arboreal life.
In The Martyrdom of Man (1876), 393.
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Many the wonders but nothing walks stranger than man.
Sophocles
First line of a choral ode in Antigone, line 332, as translated by Elizabeth Wyckoff (1954) in David Grene and Richmond Lattimore (eds.)The Complete Greek Tragedies: Sophocles (1957), Vol. 2, 170.
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Memory is a child walking along a seashore. You never can tell what small pebble it will pick up and store away among its treasured things.
In Marilyn R. Zuckerman, Incredibly American: Releasing the Heart of Quality (1992), 25.
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Nature abhors a vacuum, and if I can only walk with sufficient carelessness I am sure to be filled.
Early Spring, 52. Excerpt in H.G.O. Blake (ed.), Thoreau's Thoughts: Selections From the Writings of Henry David Thoreau (1890,2005), 112.
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Nature, the parent of all things, designed the human backbone to be like a keel or foundation. It is because we have a backbone that we can walk upright and stand erect. But this was not the only purpose for which Nature provided it; here, as elsewhere, she displayed great skill in turning the construction of a single member to a variety of different uses.
It Provides a Path for the Spinal Marrow, Yet is Flexible.
Firstly, she bored a hole through the posterior region of the bodies of all the vertebrae, thus fashioning a suitable pathway for the spinal marrow which would descend through them.
Secondly, she did not make the backbone out of one single bone with no joints. Such a unified construction would have afforded greater stability and a safer seat for the spinal marrow since, not having joints, the column could not have suffered dislocations, displacements, or distortions. If the Creator of the world had paid such attention to resistance to injury and had subordinated the value and importance of all other aims in the fabric of parts of the body to this one, he would certainly have made a single backbone with no joints, as when someone constructing an animal of wood or stone forms the backbone of one single and continuous component. Even if man were destined only to bend and straighten his back, it would not have been appropriate to construct the whole from one single bone. And in fact, since it was necessary that man, by virtue of his backbone, be able to perform a great variety of movements, it was better that it be constructed from many bones, even though as a result of this it was rendered more liable to injury.
From De Humani Corporis Fabrica Libri Septem: (1543), Book I, 57-58, as translated by William Frank Richardson, in 'Nature’s Skill in Creating a Backbone to Hold Us Erect', On The Fabric of the Human Body: Book I: The Bones and Cartilages (1998), 138.
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Once you have flown, you will walk the earth with your eyes turned skyward, for there you have been, there you long return.
…...
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One summer day, while I was walking along the country road on the farm where I was born, a section of the stone wall opposite me, and not more than three or four yards distant, suddenly fell down. Amid the general stillness and immobility about me the effect was quite startling. ... It was the sudden summing up of half a century or more of atomic changes in the material of the wall. A grain or two of sand yielded to the pressure of long years, and gravity did the rest.
Under the Apple-Trees (1916), 105.
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Scientific truth is marvellous, but moral truth is divine; and whoever breathes its air and walks by its light has found the lost paradise.
'A Few Thoughts for a Young Man' Monthly Literary Miscellany (1851), Vol. 4 & 5, 155.
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Louis Agassiz quote: Select such subjects that your pupils cannot walk out without seeing them. Train your pupils to be observer
Select such subjects that your pupils cannot walk out without seeing them. Train your pupils to be observers, and have them provided with the specimens about which you speak. If you can find nothing better, take a house-fly or a cricket, and let each one hold a specimen and examine it as you talk.
Lecture at a teaching laboratory on Penikese Island, Buzzard's Bay. Quoted from the lecture notes by David Starr Jordan, Science Sketches (1911), 146.
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Speaking of libraries: A big open-stack academic or public library is no small pleasure to work in. You’re, say, trying to do a piece on something in Nevada, and you go down to C Floor, deep in the earth, and out to what a miner would call a remote working face. You find 10995.497S just where the card catalog and the online computer thought it would be, but that is only the initial nick. The book you knew about has led you to others you did not know about. To the ceiling the shelves are loaded with books about Nevada. You pull them down, one at a time, and sit on the floor and look them over until you are sitting on a pile five feet high, at which point you are late home for dinner and you get up and walk away. It’s an incomparable boon to research, all that; but it is also a reason why there are almost no large open-stack libraries left in the world.
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The air, the water and the ground are free gifts to man and no one has the power to portion them out in parcels. Man must drink and breathe and walk and therefore each man has a right to his share of each.
The Prairie (1827).
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The appearance of Professor Benjamin Peirce, whose long gray hair, straggling grizzled beard and unusually bright eyes sparkling under a soft felt hat, as he walked briskly but rather ungracefully across the college yard, fitted very well with the opinion current among us that we were looking upon a real live genius, who had a touch of the prophet in his make-up.
Writing as a Professor Emeritus at Harvard University, a former student of Peirce, in 'Benjamin Peirce: II. Reminiscences', The American Mathematical Monthly (Jan 1925), 32, No. 1, 5.
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The child which overbalances itself in learning to walk is experimenting on the law of gravity.
In ‘Experimental Legislation’, Popular Science (Apr 1880), 16, 754.
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The sad and solemn night
Hath yet her multitude of cheerful fires;
The glorious host of light
Walk the dark hemisphere till she retires;
All through her silent watches, gliding slow,
Her constellations come, and climb the heavens, and go.
Poem, 'Hymn to the North Star', collected in Poems by William Cullen Bryant: Collected and Arranged by Himself (1873), 84.
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The science and technology which have advanced man safely into space have brought about startling medical advances for man on earth. Out of space research have come new knowledge, techniques and instruments which have enabled some bedridden invalids to walk, the totally deaf to hear, the voiceless to talk, and, in the foreseeable future, may even make it possible for the blind to “see.”
'From Outer Space—Advances For Medicine on Earth', contributed in Lillian Levy, Space, Its Impact on Man and Society (1965, reprinted 1973), 117.
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Walking home at night, I shine my flashlight up at the sky. I send billions of ... photons toward space. What is their destination? A tiny fraction will be absorbed by the air. An even smaller fraction will be intercepted by the surface of planets and stars. The vast majority ... will plod on forever. After some thousands of years they will leave our galaxy; after some millions of years they will leave our supercluster. They will wander through an even emptier, even colder realm. The universe is transparent in the direction of the future.
Atoms of Silence
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We are hit by tons of material every day, but it is all dust. We are all walking around with comet dust in our hair.
…...
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We have forgotten how to be good guests, how to walk lightly on the earth as its other creatures do.
The Stockholm Conference: Only One Earth (1972), 24.
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We reached the village of Watervliet, [New York] … and here we crossed the Hudson in a horse-tow-boat. Having never witnessed, except in America, this ingenious contrivance for crossing a river, I shall explain to you what it is … On each side of the boat, and standing on a revolving platform constructed a foot below the surface of the deck, is placed a horse, harnessed and attached to a splinter-bar which is fastened to the boat, so as to keep him in his proper position. When every thing is ready for departure, the animal is made to walk, and by the action of his feet puts the platform in motion, which, communicating with the paddle-wheels, gives them their rotatory evolution; and by this means the boat is propelled in any direction in which the helmsman wishes to go.
In Letter VIII, to a friend in England, from Lockport, New York (25 Jul 1831), collected in Narrative of a Tour in North America (1834), Vol. 1, 184-184.
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What monstrosities would walk the streets were some people’s faces as unfinished as their minds.
In Reflections on the Human Condition (1973), 55.
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When Bonner writes that ‘natural selection for optimal feeding is then presumed to be the cause of non-motility in all forms,’ I can’t help suspecting that some plants might do even better if they could walk from shade to sun–but the inherited constraints of design never permitted a trial of this intriguing option.
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When [Erwin Schrödinger] went to the Solvay conferences in Brussels, he would walk from the station to the hotel where the delegates stayed, carrying all his luggage in a rucksack and looking so like a tramp that it needed a great deal of argument at the reception desk before he could claim a room.
Quoted in Robert L. Weber, Pioneers of Science: Nobel Prize Winners in Physics (1980), 100.
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Who never walks save where he see men's tracks makes no discoveries.
In Kathrina, her Life and Mine in a Poem (1895), 220.
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Why should a lobster be any more ridiculous than a dog? ... or a cat, or a gazelle, or a lion, or any other animal one chooses to take for a walk? I have a liking for lobsters. They are peaceful, serious creatures. ... Goethe had an aversion to dogs, and he wasn't mad. They know the secrets of the sea, they don't bark.
[By walking a lobster at the end of a blue silk ribbon in the gardens of the Palais-Royal, he mocked middle-class pretensions, but caused concern for his sanity.]
Quoted by his friend, Théophile Gautier, in Portraits et souvenirs littéraires (1875). In Théophile Gautier, My Fantoms, translated by Richard Holmes (1976), 150.
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Yet I also appreciate that we cannot win this battle to save species and environments without forging an emotional bond between ourselves and nature as well–for we will not fight to save what we do not love (but only appreciate in some abstract sense). So let them all continue–the films, the books, the television programs, the zoos, the little half acre of ecological preserve in any community, the primary school lessons, the museum demonstrations, even ... the 6:00 A.M. bird walks. Let them continue and expand because we must have visceral contact in order to love. We really must make room for nature in our hearts.
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Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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Sophie Germain
Gertrude Elion
Ernest Rutherford
James Chadwick
Marcel Proust
William Harvey
Johann Goethe
John Keynes
Carl Gauss
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- 90 -
Antoine Lavoisier
Lise Meitner
Charles Babbage
Ibn Khaldun
Euclid
Ralph Emerson
Robert Bunsen
Frederick Banting
Andre Ampere
Winston Churchill
- 80 -
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Bible
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Bertrand Russell
Jean Lamarck
- 70 -
Samuel Morse
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Robert Fulton
Pierre Laplace
Humphry Davy
Thomas Edison
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Theodore Roosevelt
Carolus Linnaeus
- 60 -
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Avicenna
James Watson
William Shakespeare
- 50 -
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Alfred Wegener
John Dalton
- 40 -
Pierre Fermat
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JJ Thomson
Thomas Kuhn
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Archimedes
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- 30 -
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Richard Feynman
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- 20 -
Carl Sagan
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- 10 -
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