“There is only one virtue, justice; only one duty, to be happy; only one corollary, not to overvalue life and not to fear death.”

It is very important not to mistake hemlock for parsley, but to believe or not believe in God is not important at all.

The best mannered people make the most absurd lovers.

Instinct guides the animal better than the man. In the animal it is pure, in man it is led astray by his reason and intelligence.

Poetry must have something in it that is barbaric, vast and wild.

We are constantly railing against the passions; we ascribe to them all of man’s afflictions, and we forget that they are also the source of all his pleasures.

Disturbances in society are never more fearful than when those who are stirring up the trouble can use the pretext of religion to mask their true designs.

There is no moral precept that does not have something inconvenient about it.

If there is one realm in which it is essential to be sublime, it is in wickedness. You spit on a petty thief, but you can’t deny a kind of respect for the great criminal.

There are three principal means of acquiring knowledge, observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.

Power acquired by violence is only a usurpation, and lasts only as long as the force of him who commands prevails over that of those who obey.

There is no kind of harassment that a man may not inflict on a woman with impunity in civilized societies.

Distance is a great promoter of admiration.

When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music.

What has not been examined impartially has not been well examined. Skepticism is therefore the first step towards truth.

The God of the Christians is a father who makes much of his apples, and very little of his children.

Does not vanity itself cease to be blamable, is it not even ennobled, when it is directed to laudable objects, when it confines itself to prompting us to great and generous actions?