One should preach not from one’s rational mind but rather from the heart. Only that which is from the heart can touch another heart. One must never attack or oppose anyone. If he who preaches must tell people to keep away from a certain kind of evil, he must do so meekly and humbly, with fear of God.
Those who are strict with others can only reach a certain level in spiritual life. They remain at the stage of physical asceticism.