Knowledge which is divorced from justice, may be called cunning rather than wisdom.

True scholarship consists in knowing not what things exist, but what they mean; it is not memory but judgment.

Knowledge rests not upon truth alone, but upon error also.

Knowledge always demands increase; it is like fire, which must first be kindled by some external agent, but will afterwards always propagate itself.

Never by reflection, but only by doing is self-knowledge possible to one.

Only a fool knows everything. A wise man knows how little he knows.

Many of us don't have to turn out the lights to be in the dark.

Knowledge of the world in only to be acquired in the world, and not in a closet.

Knowledge is the small part of ignorance that we arrange and classify.

I am not young enough to know everything.