It includes all of the Buddhist teachings (or "three vehicles"). All traditions of Tibetan Buddhism practice the vows of moral discipline ("Pratimoksha") of the hearer's vehicle (Shrāvakayāna); the vows of universal liberation or "Bodhisattva vow" and philosophy of the great vehicle (Mahāyāna); and the pledges and special methods of the secret mantra vehicle or Vajrayāna. 