All our dignity lies in our thoughts.

Instead of complaining that God had hidden himself, you will give Him thanks for having revealed so much of Himself.

Force rules the world-not opinion; but it is opinion that makes use of force.

Curiosity is nothing more than vanity. More often than not we only seek knowledge to show it off.

I take it as a matter not to be disputed, that if all knew what each said of the other, there would not be four friends in the world. This seems proved by the quarrels and disputes caused by the disclosures which are occasionally made.

Vanity of science. Knowledge of physical science will not console me for ignorance of morality in time of affliction, but knowledge of morality will always console me for ignorance of physical science.

Reverend Fathers, my letters did not usually follow each other at such close intervals, nor were they so long.... This one would not be so long had I but the leisure to make it shorter.