Real knowledge is to know the extent of one's ignorance.

Education is the path from cocky ignorance to miserable uncertainty.

The ignorant man is an ox. He grows in size, not in wisdom.

The world is not composed of heroes and villains, but of men and women with all the passions that God has given them. The ignorant condemn, but the wise pity.

To Believe without evidence and demonstration is an act of ignorance and folly.

True wisdom lies in one's confession about the limits of one's knowledge.