When we see a natural style, we are astonished and charmed; for we expected to see an author, and we find a person.

The last thing we decide in writing a book is what to put first.

True eloquence makes light of eloquence, true morality makes light of morality; that is to say, the morality of the judgment, which has no rules, makes light of the morality of the intellect.... To make light of philosophy is to be a true philosopher.

Unless we love the truth we cannot know it.

The war existing between the senses and reason.

When we see an effect happen always in the same manner, we infer that it takes place by a natural necessity; as, for instance, that the sun will rise to morrow; but nature often deceives us, and will not submit to its own rules.

The heart has its order, the mind has its own, which uses principles and demonstrations. The heart has a different one. We do not prove that we ought to be loved by setting out in order the causes of love; that would be absurd.