The Mahayana school was a later development in Buddhist philosophy. It is called the Greater Vehicle in reference to the Mahayana notion of salvation. According to this system of belief, it is possible for all people to reach enlightenment under the guidance of a dedicated teacher or Theravada notion of enlightenment reserved for a select few scholars and monks. The difference between Mahayana and Theravada Buddhism can be seen as one of interpretation. Mahayana scholars interpret the sacred texts in a more liberal manner, where as the Theravada monks use the texts literally. The Mahayana school generalizes that it is possible for all people to reach an enlightened state and work towards that goal. The Boddhisattva, or teacher, is the central figure in Mahayana style Buddhism. The Boddhisattva is a soul who has already reached enlightenment, but chooses to postpone their ascension into Nirvana in order to teach others. The Boddhisattva is unique to Mahayana Buddhism and plays a central role in theology. The Boddhisattva works under the ultimate directive of compassion. Meaning that it is an incredible act of compassion for a person to deny themselves the pleasure of enlightenment in order to share their wisdom with others. Many argue that the Buddha himself was an archetypal Boddhisattva, choosing to spread the word to others instead of merely attaining enlightenment for himself.