My passions, concentrated on a single point, resemble the rays of a sun assembled by a magnifying glass: they immediately set fire to whatever object they find in their way.

Those laws, being forged for universal application, are in perpetual conflict with personal interest, just as personal interest is always in contradiction with the general interest. Good for society, our laws are very bad for the individuals whereof it is composed; for, if they one time protect the individual, they hinder, trouble, fetter him for three quarters of his life.

Do not breed. Nothing gives less pleasure than childbearing. Pregnancies are damaging to health, spoil the figure, wither the charms, and it's the cloud of uncertainty forever hanging over these events that darkens a husband's mood.

Any punishment that does not correct, that can merely rouse rebellion in whoever has to endure it, is a piece of gratuitous infamy which makes those who impose it more guilty in the eyes of humanity, good sense and reason, nay a hundred times more guilty than the victim on whom the punishment is inflicted.

Happiness is ideal, it is the work of the imagination.

And if I were a naughty little boy, the idea is to spank me into good behavior?

One must feel sorry for those who have strange tastes, but never insult them. Their wrong is Nature's too; they are no more responsible for having come into the world with tendencies unlike ours than are we for being born bandy-legged or well-proportioned.