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Who said: “Dangerous... to take shelter under a tree, during a thunder-gust. It has been fatal to many, both men and beasts.”
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Beware Quotes (16 quotes)

A learned man is an idler who kills time with study. Beware of his false knowledge: it is more dangerous than ignorance.
In 'Maxims for Revolutionists: Education', in Man and Superman (1905), 230.
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Amoeba has her picture in the book,
Proud Protozoon!—Yet beware of pride,
All she can do is fatten and divide;
She cannot even read, or sew, or cook…
The Worm can crawl
But has no eyes to look.
The Jelly-fish can swim
But lacks a bride.
Essay read at the Heretics Club, Cambridge (May 1922), 'Philosophic Ants', collected in Essays of a Biologist (1923), 176.
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Beware of finding what you're looking for.
A favorite aphorism he often used.
Though widely seen attributed as a caution Hamming often used, webmaster has found no evidence that he originated the saying. If you know a primary source, please contact webmaster.
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Beware of old Linnaeus,
The Man of the Linden-tree,
So beautiful, bright and early
He brushed away the dews
He found the wicked wild-flowers
All courting there in twos.
In 'Tycho Brahe', The Torch-Bearers: The Book of Earth (1925), Vol. 2, 174.
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Beware of the problem of testing too many hypotheses; the more you torture the data, the more likely they are to confess, but confessions obtained under duress may not be admissible in the court of scientific opinion.
In Matthew H. Nitecki and Antoni Hoffman (eds.), 'Testing Hypotheses or Fitting Models? Another Look at Mass Extinctions', Neutral Models in Biology (1987), 148.
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Beware of the young Doctor, & the old Barber.
In Poor Richard's Almanack (1733).
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Beware when the great God lets loose a thinker on this planet. Then all things are at risk. ... There is not a piece of science, but its flank may be turned to-morrow.
From 'Circles', collected in The Complete Works of Ralph Waldo Emerson (1903), 308.
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I was sitting writing at my textbook but the work did not progress; my thoughts were elsewhere. I turned my chair to the fire and dozed. Again the atoms were gambolling before my eyes. This time the smaller groups kept modestly in the background. My mental eye, rendered more acute by the repeated visions of the kind, could now distinguish larger structures of manifold confirmation: long rows, sometimes more closely fitted together all twining and twisting in snake like motion. But look! What was that? One of the snakes had seized hold of its own tail, and the form whirled mockingly before my eyes. As if by a flash of lightning I awoke; and this time also I spent the rest of the night in working out the rest of the hypothesis. Let us learn to dream, gentlemen, then perhaps we shall find the truth... But let us beware of publishing our dreams till they have been tested by waking understanding.
Kekule at Benzolfest in Berichte (1890), 23, 1302.
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I would by all means have men beware, lest Ζsop’s pretty fable of the fly that sate [sic] on the pole of a chariot at the Olympic races and said, “What a dust do I raise,” be verified in them. For so it is that some small observation, and that disturbed sometimes by the instrument, sometimes by the eye, sometimes by the calculation, and which may be owing to some real change in the heaven, raises new heavens and new spheres and circles.
'Of Vain Glory' (1625) in James Spedding, Robert Ellis and Douglas Heath (eds.), The Works of Francis Bacon (1887-1901), Vol. 6, 503.
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In medicine … beware of ambiguity.
In A Philosophical Dictionary (1824), Vol. 1, 39.
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The conservative has but little to fear from the man whose reason is the servant of his passions, but let him beware of him in whom reason has become the greatest and most terrible of the passions.
In Daedalus, or Science and the Future (1923).
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The Dark Ages may return—the Stone Age may return on the gleaming wings of Science; and what might now shower immeasureable material blessings upon mankind may even bring about its total destruction. Beware! I say. Time may be short.
Referring to the discovery of atomic energy.
“Iron Curtain” speech at Fulton, Missouri (5 Mar 1946). Maxims and Reflections (1947), 164.
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The good Christian should beware of mathematicians, and all those who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and to confine man in the bonds of Hell.
Mathematician refers to astrologer. From De Genesi ad Litteram (400s), Book 2, xviii, 37. As quoted in Morris Kline, Mathematics in Western Culture (1953, 1964), 3.
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The words figure and fictitious both derive from the same Latin root, fingere. Beware!
In Facts from Figures (1951), 56.
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There is no supernatural, there is only nature. Nature alone exists and contains all. All is. There is the part of nature that we perceive, and the part of nature that we do not perceive. … If you abandon these facts, beware; charlatans will light upon them, also the imbecile. There is no mean: science, or ignorance. If science does not want these facts, ignorance will take them up. You have refused to enlarge human intelligence, you augment human stupidity. When Laplace withdraws Cagliostro appears.
In Victor Hugo and Lorenzo O'Rourke (trans.) Victor Hugo's Intellectual Autobiography: (Postscriptum de ma vie) (1907), 320.
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[1665-08-16] ...Hence to the Exchange, which I have not been a great while. But Lord, how sad a sight it is to see the streets empty of people, and very few upon the Change - jealous of every door that one sees shut up, lest it should be the plague - and about us, two shops in three, if not more, generally shut up. ... It was dark before I could get home; and so land at church-yard stairs, where to my great trouble I met a dead Corps, of the plague, in the narrow ally, just bringing down a little pair of stairs - but I thank God I was not much disturbed at it. However, I shall beware of being late abroad again.
Diary of Samuel Pepys (16 Aug 1665)
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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
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Marcel Proust
William Harvey
Johann Goethe
John Keynes
Carl Gauss
Paul Feyerabend
- 90 -
Antoine Lavoisier
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Charles Babbage
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Euclid
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Andre Ampere
Winston Churchill
- 80 -
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Bible
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- 70 -
Samuel Morse
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Robert Fulton
Pierre Laplace
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Thomas Edison
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Carolus Linnaeus
- 60 -
Francis Galton
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Avicenna
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- 50 -
Stephen Hawking
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Richard Dawkins
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Alfred Wegener
John Dalton
- 40 -
Pierre Fermat
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Giordano Bruno
JJ Thomson
Thomas Kuhn
Leonardo DaVinci
Archimedes
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- 30 -
Andreas Vesalius
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Richard Feynman
James Hutton
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Emile Durkheim
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- 20 -
Carl Sagan
James Maxwell
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Francis Crick
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Francis Bacon
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- 10 -
Aristotle
John Watson
Rosalind Franklin
Michio Kaku
Isaac Asimov
Charles Darwin
Sigmund Freud
Albert Einstein
Florence Nightingale
Isaac Newton



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