The third volume of the Complete Works of the holy Church teacher of mysticism contains "The Song of Love." John of the Cross freely composed the song using motifs from the biblical Song of Songs. It is considered one of the highest poetic creations in world literature. Later, he provided a more sober prose interpretation, always aware that no rational explanation can match the intensity of the poetic expression. The annotated version of the "Song" was completed by June 1586 at the latest, when John of the Cross presented it to the venerable Mother Ana de Jesus. This work is one of the highlights of an ancient tradition that sees the "Song of Songs" as the center of theology—because of the revelation—depicting the bridal love between God and humanity. As a glorification of the Christian mystery, the work remains as fresh and enriching as it was upon its release.