Propagate Quotes (5 quotes)
Knowledge always desires increase; it is like fire which must first be kindled by some external agent, but which will afterward propagate itself.
Light is always propagated in empty space with a definite velocity, c, which is independent of the state of motion of the emitting body.
Pictures, propagated by motion along the fibers of the optic nerves in the brain, are the cause of vision.
So long as a man remains a gregarious and sociable being, he cannot cut himself off from the gratification of the instinct of imparting what he is learning, of propagating through others the ideas and impressions seething in his own brain, without stunting and atrophying his moral nature and drying up the surest sources of his future intellectual replenishment.
We must therefore bear the undoubtedly bad effect s of the weak surviving and propagating their kind; but there appears to be at least one check in steady action, namely that the weaker and inferior members of society do not marry so freely as the sound; and this check might be indefinitely increased by the weak in body or mind refraining from marriage, though this is more to be hoped for than expected.