Self-interest speaks all manner of tongues and plays all manner of parts, even that of disinterestedness.

Envy is destroyed by true friendship, as coquetry by true love.

As uncommon a thing as true love is, it is yet easier to find than true friendship.

We are much harder on people who betray us in small ways than on people who betray others in great ones.

Passion makes idiots of the cleverest men, and makes the biggest idiots clever.

The extreme pleasure we take in speaking of ourselves should make us apprehensive that it gives hardly any to those who listen to us.

Boredom ... causes us to neglect more duties than does interest.