The Guru Granth Sahib (also known as the Adi Granth) is truely unique among the world's great scriptures. It is considered the Supreme Spiritual Authority and Head of the Sikh religion, rather than any living person. It is also the only scripture of it's kind which not only contains the works of it's own religious founders but also writings of people from other faiths. The living Guru of the Sikhs, the book is held in great reverence by Sikhs and treated with the utmost respect. Sikhism rejects idol worship, so the Guru Granth Sahib is not worshipped as an idol, but rather emphasis is placed on respect of the book for the writings which appear within. Guru Granth Sahib is a collection of devotional hymns and poetry which proclaims God, lays stress on meditation on the True Guru (God), and lays down moral and ethical rules for development of the soul, spiritual salvation and unity with God.