Guru Nanak's followers were Sikhs (seekers of truth). He taught them to bow only before God, and to link themselves to the Guru, the Light of Truth, who lives always in direct consciousness of God, experiencing no separation. Through words and example, the Guru demonstrates to followers how to experience God within themselves, bringing them from darkness into light. Guru Nanak was a humble bearer of this Light of Truth. He opposed superstition, injustice, and hypocrisy and inspired seekers by singing divine songs which were touched the hearts of the most callous listeners. These songs were recorded, and formed the beginnings of the Sikhs' sacred writings, later to become the "Siri Guru Granth Sahib".