We are what our thoughts have made us; so take care about what you think. Words are secondary. Thoughts live; they travel far.

The small wisdom is like water in a glass: clear, transparent, pure. The great wisdom is like the water in the sea: dark, mysterious, impenetrable.

The highest wisdom has but one science - the science of the whole - the science explaining the whole creation and man's place in it.

We can know only that we know nothing. And that is the highest degree of human wisdom.

Though one should live a hundred years without wisdom and control, yet better, indeed, is a single day's life of one who is wise and meditative.

Wisdom cries out in the streets, and no man regards it.