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.

Awareness of ignorance is the beginning of wisdom.

Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power.

What is important is not the quantity of your knowledge but its quality. You can know many things without knowing the most important.

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

Nothing is so necessary for a young man as the company of intelligent women.