A mathematician is only perfect insofar as he is a perfect man, sensitive to the beauty of truth.

Freedom consists not in refusing to recognize anything above us, but in respecting something which is above us; for by respecting it, we raise ourselves to it, and, by our very acknowledgment, prove that we bear within ourselves what is higher, and are worthy to be on a level with it.

If all these devils really exist it proves there must be angels, too.

If we meet someone who owes us a debt of gratitude, we remember the fact at once. How often we can meet someone to whom we owe a debt of gratitude without thinking about it at all!

Fortunately, we can take in only so much misfortune; what exceeds that limit either destroys us or leaves us indifferent.

You'll never attain it unless you know the feeling.

If one doesn't know one's own country, one doesn't have standards for foreign countries.