There is in Persian literature a poem by Hafiz who tells us that, when God commanded the soul to enter the human body, which is made of clay, the soul refused. Then angels were asked to sing and on hearing the angels sing the soul entered the body which it had feared to be a prison. It is a philosophy which is poetically expressed in this story. Hafiz remarked: "People say that on hearing the song the soul entered into the body, but in reality the soul itself was song."