On the spiritual side, the basic beliefs of Sikhism comprise a philosophic vision of the Supreme Reality, a discipline that affords mystical experience of harmony with the Supreme Being, and a vision of values constituting the Ideal of human life. Gurbani, supplemented by the hymns of Bhagat's and Bhatts, presents a rich variety of metaphysical beliefs concerning God, Nature and Man as also the values and virtues to be inculcated in human life.