"Since the mind according to Buddhism, is in a constant state of flux, it is necessary, as the first stage in meditational process, to overcome the “impurity” of mental agitation in order to attain tranquility of mind such that all stimuli, both internal and external, are extruded from consciousness. Only after achieving such a state, by means of tranqulity-meditation (samatha-bhavana), a state which permits one-point concentration, can one proceed to the second stage, that of insight meditation (vipasana-bhavana)"