On deeper level, there differences emphases placed on certain aspects of the Buddha's teaching and in the methods of religious training. Thus, while Theravada stresses the importance of monastic discipline as the preliminary requisite for higher spiritual development, Mahayana saw the need to modify and adapt it, in accordance with changing circumstance. The Bodhisattva ideals through accepted and tough in the Theravada tradition, are much more strongly emphasized in the Mahayana system and are consider central to their religious practice.