Therefore, for an adept, no cost and no sacrifice is great enough to keep harmony within himself. A Sufi tries to keep harmony in his surroundings, the harmony which demands many sacrifices. It makes one endure what one is not willing to endure, it makes one overlook what one is not inclined to overlook, it makes one tolerate what one is not accustomed to tolerate, and it makes one forgive and forget what one would never have forgotten if it were not for the sake of harmony. But at whatever cost harmony is attained, it is a good bargain. For harmony is the secret of happiness, and in absence of this a person living in palaces and rolling in gold can be most unhappy.