There are more fools in the world than there are people.
The men of action are, after all, only the unconscious instruments of the men of thought.
A gloss is a total system of perception and language.
From all this it follows what the general character of the problem of the development of a body of scientific knowledge is, in so far as it depends on elements internal to science itself.
Like a great poet, Nature knows how to produce the greatest effects with the most limited means.
He who will not reason, is a bigot; he who cannot is a fool; and he who dares not is a slave.
I study myself more than any other subject; it is my metaphysic, and my physic.
Experience is a good school. But the fees are high.
It is probably safe to say that all the changes of factual knowledge which have led to the relativity theory, resulting in a very great theoretical development, are completely trivial from any point of view except their relevance to the structure of a theoretical system.
Music played at weddings always reminds me of the music played for soldiers before they go into battle.