When couples have children in excess, let abortion be procured before sense and life have begun; what may or may not be lawfully done in these cases depends on the question of life and sensation.

The true nature of a thing is the highest it can become.

Where perception is, there also are pain and pleasure, and where these are, there, of necessity, is desire.

Friendship is a thing most necessary to life, since without friends no one would choose to live, though possessed of all other advantages.

While fiction is often impossible, it should not be implausible.

Selfishness doesn't consist in a love to yourself, but in a big degree of such love.

Happiness does not consist in pastimes and amusements but in virtuous activities.