French Writer, Moralist, "The Theophrastus of France"
The first thing men do when they have renounced pleasure, through decency, lassitude, or for the sake of health, is to condemn it in others. Such conduct denotes a kind of latent affection for the very things they left off; they would like no one to enjoy a pleasure they can no longer indulge in; and thus they show their feelings of jealousy.
Profound ignorance makes a man dogmatic. The man who knows nothing thinks he is teaching others what he has just learned himself; the man who knows a great deal cannot imagine that what he is saying is not common knowledge, and speaks more indifferently.