No one can read the history of astronomy without perceiving that Copernicus, Newton, Laplace, are not new men, or a new kind of men, but that Thales, Anaximenes, Hipparchus, Empodocles, Aristorchus, Pythagorus, Oenipodes, had anticipated them.

Those who have ruled human destinies, like planets, for thousands of years, were not handsome men.

A walk in the woods is only an exalted dream.

Every time you wink the stars move.

The glory of friendship is not the outstretched hand, not the kindly smile, nor the joy of companionship; it is the spiritual inspiration that comes to one when you discover that someone else believes in you and is willing to trust you with a friendship.

If you would serve your brother it is fit for you to serve him, do not take back your words when you find that prudent people do not commend you. Be true to your own act, and congratulate yourself if you have done something strange and extravagant and broken the monotony of a decorous age.

A certain awkwardness marks the use of borrowed thoughts; but as soon as we have learned what to do with them, they become our own.