Gratitude is a useless word. You will find it in a dictionary but not in life.

What seems to be generosity is often no more than disguised ambition, which overlooks a small interest in order to secure a great one.

Men would not live in society long if they were not each others dupes.

When a man is in love, he doubts, very often, what he most firmly believes.

The constancy of the wise is only the talent of concealing the agitation of their hearts.

Jealousy is in some measure just and reasonable, since it merely aims at keeping something that belongs to us or we think belongsto us, whereas envy is a frenzy that cannot bear anything that belongs to others.

Only strong natures can really be sweet ones; those that seem sweet are in general only weak, and may easily turn sour.