A sure sign of a good book is that you like it more the older you get.

All mathematical laws which we find in Nature are always suspect to me, in spite of their beauty. They give me no pleasure. They are merely auxiliaries. At close range it is all not true.

How might letters be most efficiently copied so that the blind might read them with their fingers?

God: personified incomprehensibility.

What most clearly characterizes true freedom and its true employment is its misemployment.

If all else fails, the character of a man can be recognized by nothing so surely as by a jest which he takes badly.

When an acquaintance goes by I often step back from my window, not so much to spare him the effort of acknowledging me as to spare myself the embarrassment of seeing that he has not done so.