It is not difficult to slide on the line already made on one's mind; the difficulty is to act contrary to the line which is engraved there, especially in the case when it happens to be an undesirable line. Shiva, the great Lord of Yogis, has given a special teaching on the subject, which he calls Viprit Karnai: "Acting contrary to one's nature." And he gives great importance to this method of working with oneself, that by this method in the end one arrives at mastery.