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There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves.

The learned man knows that he is ignorant.

Men have always shown a dim knowledge of their better potentialities by paying homage to those purest leaders who taught the simplest and most inclusive rules for an undivided mankind.

Self-knowledge comes from knowing other men.

Men must be taught as if you taught them not, and things unknown proposed as things forgot.

Men need knowledge in order to overpower their passions and master their prejudices.

From their experience or from the recorded experience of others (history), men learn only what their passions and their metaphysical prejudices allow them to learn.

Man can learn nothing except by going from the known to the unknown.