Jealousy lives upon doubts. It becomes madness or ceases entirely as soon as we pass from doubt to certainty.

Truth does less good in the world than its appearances do harm.

In the human heart there is a ceaseless birth of passions, so that the destruction of one is almost always the establishment of another.

What renders other people's vanity insufferable is that it wounds our own.

There are reproaches which praise, and praises which defame.

We often boast that we are never bored; but yet we are so conceited that we do not perceive how often we bore others.

It seems that nature, which has so wisely disposed our bodily organs with a view to our happiness, has also bestowed on us pride, to spare us the pain of being aware of our imperfections.