Which means, the heart of man is first a reed, and the suffering and pain it goes through make it a flute, which can then be used by God as the instrument to produce the music that He constantly wishes to produce. But every reed is not a flute, and so every heart is not His instrument. As the reeds need to be made into flutes, so the human heart can be turned into an instrument and can be offered to the God of love. It is the human heart which becomes the harp of the angels, it is the human heart which is the lute of Orpheus. It is on the model of the heart of man that the first instrument of music was made, and no earthly instrument can produce that music which the heart produces, raising the mortal soul to immortality.