Nanak was the founder of Sikhism. He boldly practised and preached equality of man before God-"The one Great and True Being". He rebelled against the caste system and defied brahminical rituals. As a great prophet with a vision of finding God in man and aiming at building a classless and casteless society, he went from place to place singing the glory of God and spreading his divine message of love through his own compositions. He had miraculous powers, several manifestations of which during his lifetime are recorded. His desriptions of the Almighty come from his own Self-realization and from a beautiful synthesis of the Upanishads, mystic experiences across the world, and the teachings of the Budha, Christ and Prophet Muhammad. He acknowledged Kabir as his spiritual guide.