When intuition and logic agree, you are always right.

Fear not, provided you fear; but if you fear not, then fear.

Vanity is so secure in the heart of man that everyone wants to be admired: even I who write this, and you who read this.

Let man then contemplate nature in full and lofty majesty, and turn his eyes away from the mean objects which surround him. Let him look at the dazzling light hung aloft as an eternal lamp to lighten the universe; let him behold the earth, a mere dot compared with the vast circuit which that orb describes, and stand amazed to find that the vast circuit itself is but a very fine point compared with the orbit traced by the starts as they roll their course on high.

Mankind suffers from two excesses: to exclude reason, and to live by nothing but reason.

The heart has its order, the mind has its own, which uses principles and demonstrations. The heart has a different one. We do not prove that we ought to be loved by setting out in order the causes of love; that would be absurd.

It is not shameful for a man to succumb to pain and it is shameful to succumb to pleasure.