There is one difference between the Sufis and the Yogis, and all the other mystics. Their ideas, their thoughts and their life are quite the same, but you will see the Sufis sometimes in tears and sometimes in joy. Worldly persons think: "They are mad!", and mystics may think: "They are on the surface; they are not on the same level." To the Sufi, self-pity, tears at what happens to the self, are haram -- prohibited. But tears in the thought of the Beloved, in the realization of some truth, are allowable. Extreme joy for what happens to the self is not allowable, but joy in the thought of the Beloved, is allowable. The heart is touched, it is moved by the thought of God. It is then that the dervishes dance. Sometimes the dance expresses the action of the Beloved, sometimes it is the face of the Beloved.