Many a yogi will criticize this threefold path to realization. He will say meditation alone will be enough. He will deprecate the necessity of knowing metaphysics and ridicule the call to inspired action. But to show that I am introducing no new-fangled notion of my own here, it may be pointed out that in Buddhism there is a recognized triple discipline of attainment, consisting of (1) dyhana (meditation practice), (2) prajna (higher understanding), (3) sila (self-denying conduct).
-- Perspectives > Chapter 2: Practices for the Quest > # 6