Learning acquired in youth arrests the evil of old age; and if you understand that old age has wisdom for its food, you will so conduct yourself in youth that your old age will not lack for nourishment.

Do not look for a sanctuary in anyone except yourself.

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

Insanity is doing the same thing, over and over again, but expecting different results.

Not everything that counts can be counted, and not everything that can be counted counts.

We should take care not to make the intellect our goal; it has, of course, powerful muscles, but no personality.