It is almost impossible to substitute intelligence for experience.

No one can draw more out of things, books included, than he already knows. A man has no ears for that to which experience has given him no access.

We learn from experience that men never learn anything from experience.

No man knows distinctly anything, and no man ever will.

We can be knowledgeable with other men’s knowledge, but we can’t be wise with other men’s wisdom.

a man only knows what he's experienced

We can be knowledgeable with another man's knowledge, but we can't be wise with another man's wisdom.

No power and no treasure can outweigh the extension of our knowledge.

The only source of knowledge is experience.

No teacher is greater than one’s own experience.

The end of man is knowledge, but there is one thing he can't know.

None but those who have experienced them can conceive of the enticements of science.

A man who has the knowledge but lacks the power clearly to express it is no better off than if he never had any ideas at all.

History teaches us that man learns nothing from history.