Being able to tolerate stupid people

The wise have always been little tolerant, who adds science adds impatience. He who knows much is hard to please. The greatest rule of life is, according to Epictetus, tolerance, and in it he made half of knowledge. If one has to tolerate all foolishness, one will need a lot of patience. Sometimes the people we tolerate the most are those on whom we depend, because this serves to learn how to win. From tolerance comes the priceless peace, which is the best there is on earth. And whoever does not find himself in the disposition to tolerate, let him resort to withdrawing into himself, provided he can tolerate at least himself.

(Baltasar Gracian, 1647)