One whose knowledge is confined to books and whose wealth is in the possession of others, can use neither his knowledge nor wealth when the need for them arises.

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

A smart man isn't necessarily one who knows all the answers, but knows where to find them.

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

Long is the night to him who is awake; long is a mile to him who is tired; long is life to the foolish who do not know the true law.

To know, is to know that you know nothing. That is the meaning of true knowledge.