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.

I assumed that everything must yield to me, that the entire universe had to flatter my whims, and that I had the right to satisfy them at will.

Behold, my love, behold all that I simultaneously do: scandal, seduction, bad example, incest, adultery, sodomy! Oh, Satan! one and unique God of my soul, inspire thou in me something yet more, present further perversions to my smoking heart, and then shalt thou see how I shall plunge myself into them all!

Nothing we can do outrages Nature directly. Our acts of destruction give her new vigour and feed her energy, but none of our wreckings can weaken her power.

The imagination is the spur of delights... all depends upon it, it is the mainspring of everything; now, is it not by means of the imagination one knows joy? Is it not of the imagination that the sharpest pleasures arise?

The mechanism that directs government cannot be virtuous, because it is impossible to thwart every crime, to protect oneself from every criminal without being criminal too; that which directs corrupt mankind must be corrupt itself; and it will never be by means of virtue, virtue being inert and passive, that you will maintain control over vice, which is ever active: the governor must be more energetic than the governed.

One is never so dangerous when one has no shame, than when one has grown too old to blush.