Darrell Calkins said this quote
“ Historically, techniques to attain altered states of consciousness, usually called meditation, or sometimes prayer, actually involve various forms of concentration, the first level of this kind of internal work. The linear scale of progression is Concentration, then Meditation, and finally Contemplation. Virtually all categories of meditation are, in actuality, forms of concentration. What makes them so are the innate “goals” or ambitions attached to them: to achieve a state or to acquire something, like relaxation, insight or “advancement.” This then constructs a dichotomy, or dualism, between the pursuer and the thing pursued. That is, you are conscious of or believe in something “better,” you are separate from it, and there is effort to attain it. ”