Judgement can do without knowledge: but not knowledge without judgement.

There is nothing useless in nature; not even uselessness itself

It takes strong ears indeed to hear ourselves judged frankly, and because there are few who can endure criticism without being stung by it, those who venture to criticize us perform a remarkable act of friendship. For it is a healthy love that will risk wounding or offending in order to profer a benefit.

There is a certain amount of purpose, acquiescence, and satisfaction in nursing one's melancholy.

Teach him a certain refinement in sorting out and selecting his arguments, with an affection for relevance and so for brevity. Above all let him be taught to throw down his arms and surrender to truth as soon as he perceives it, whether the truth is born at his rival's doing or within himself from some change in his ideas.

A wise man loses nothing, if he but save himself.

And truly Philosophy is but sophisticated poetry. Whence do those ancient writers derive all their authority but from the poets?