A physician is not angry at the intemperance of a mad patient, nor does he take it ill to be railed at by a man in fever. Just so should a wise man treat all mankind, as a physician does his patient, and look upon them only as sick and extravagant.

It is part of the cure to wish to be cured.

You roll my log, and I will roll yours.

The deep waters of time will flow over us: only a few men of genius will lift a head above the surface, and though doomed eventually to pass into the same silence, will fight against oblivion and for a long time hold their own.

Shun no toil to make yourself remarkable by some talent or other; yet do not devote yourself to one branch exclusively. Strive to get clear notions about all. Give up no science entirely; for science is but one.

Whatever one of us blames in another, each one will find in his own heart.

Men can be divided into 2 groups: one that goes ahead and achieves something, and one that comes after and criticizes.