This continual development of understanding of the law of harmony produces in the Sufi that goodness which he or she calls divine. Harmony is the sign of life. What is life? Life, in poetic words, may be called love. The loveless heart may have all the religion and all the knowledge, yet it is dead. As the Bible says, "God is love." God is in the heart of each person, and the heart of each person is the highest heaven. When that heart is closed by the absence of love, then God is closed. When this heart is open, God is open, and one is alive from that time.