“Believe me, Eugenie, the words "vice" and "virtue" supply us only with local meanings. There is no action, however bizarre you may picture it, that is truly criminal; or one that can really be called virtuous. Everything depends on our customs and on the climates we live in. What is considered a crime here is often a virtue a few hundred leagues away; and the virtues of another hemisphere might, quite conversely, be regarded as crimes among us. There is no atrocity that hasn't been deified, no virtue that hasn't been stigmatized.”

“Lust is to the other passions what the nervous fluid is to life; it supports them all, lends strength to them all ambition, cruelty, avarice, revenge, are all founded on lust.”

“Do the meager pleasures you have been able to enjoy during your fall compensate for the torments which now rend your heart? Happiness therefore lies only in virtue,my child, and all the sophistries of its detractors can never procure a single one of its delights.”

“Whether or not it is dangerous to read Sade is a question that easily becomes lost in a multitude of others and has never been settled except by those whose arguments are rooted in the conviction that reading leads to trouble. So it does; so it must, for reading leads nowhere but to questions.”

“A book is a private thing, citizen; it belongs to the one who writes it and to the one who reads it. Like the mind itself, a book is a private space. Within that space, anything is possible. The greatest evil and the greatest good.”

“Every death even the cruelest deathdrowns in the total indifference of NatureNature herself would watch unmovedif we destroyed the entire human raceI hate Naturethis passionless spectator this unbreakable iceberg-facethat can bear everythingthis goads us to greater and greater acts”

“The more defects a man may have, the older he is, the less lovable, the more resounding his success.”

“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?”

“Never lose sight of the fact that all human felicity lies in man's imagination, and that he cannot think to attain it unless he heeds all his caprices. The most fortunate of persons is he who has the most means to satisfy his vagaries.”

“Between understanding and faith immediate connections must subsist.”

“No lover, if he be of good faith, and sincere, will deny he would prefer to see his mistress dead than unfaithful.”