Let the degree of egotism be the measure of confidence.

Desire is the uneasiness a man finds in himself upon the absence of anything whose present enjoyment carries the idea of delight with it.

What knowledge is there of which man is capable that is not founded on the exterior,--the relation that exists between visible and invisible, the perceptible and the imperceptible?

Words are the wings of actions.

Kiss the hand of him who can renounce what he has publicly taught when convicted of his error, and who, with heartfelt joy, embraces truth, though with the sacrifice of favourite opinions.

His calumny is not only the greatest benefit a rogue can confer on us, but the only service he will perform for nothing.

Conscience is wiser than science.