Sex should be a perfect balance of pain and pleasure. Without that symmetry, sex becomes a routine rather than an indulgence.

The idea of God is the sole wrong for which I cannot forgive mankind.

Every principle is a judgment, every judgment the outcome of experience, and experience is only acquired by the exercise of the senses; whence it follows that religious principles bear upon nothing whatever and are not in the slightest innate. Ignorance and fear, you will repeat to them, ignorance and fear - those are the twin bases of every religion.

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 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.

There are thorns everywhere, but along the path of vice, roses bloom above them.

Nature, who for the perfect maintenance of the laws of her general equilibrium, has sometimes need of vices and sometimes of virtues, inspires now this impulse, now that one, in accordance with what she requires.