It is not my mode of thought that has caused my misfortunes, but the mode of thought of others.

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.

It is not my mode of thought that has caused my misfortunes, but the mode of thought of others.

If the objects who serve us feel ecstacy, they are much more often concerned with themselves than with us, and our own enjoyment is consequently impaired. The idea of seeing another person experience the same pleasure reduces one to a kind of equality which spoils the unutterable charms that come from despotism.

Nature has endowed each of us with a capacity for kindly feelings: let us not squander them on others.

In libertinage, nothing is frightful, because everything libertinage suggests is also a natural inspiration; the most extraordinary, the most bizarre acts, those which most arrantly seem to conflict with every law, every human institution... even those that are not frightful, and there is not one amongst them all that cannot be demonstrated within the boundaries of nature.

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