We now possess four principles of morality: 1) a philosophical: do good for its own sake, out of respect for the law; 2) a religious: do good because it is God's will, out of love of God; 3) a human: do good because it will promote your happiness, out of self-love; 4) a political: do good because it will promote the welfare of the society of which you are a part, out of love of society having regard to yourself. But is this not all one single principle, only viewed from different sides?

The greater part of human misery is caused by indolence.

You can make a good living from soothsaying but not from truthsaying.

To write brashly about some things, it is almost necessary not to know much about them.

It is a sure evidence of a good book if it pleases us more and more as we grow older.

Barbaric accuracy - whimpering humility.

Nothing is more conducive to peace of mind than not having any opinion at all.