The transformation of body and mind is a major hallmark of realization.

Why does direct realization involve the transformation of body and mind, and why is the transformation of body and mind a major, obvious, and clear-cut hallmark? Because the world of body and mind, from beginningless kalpas past until beginningless kalpas to come, is controlled and regulated by the manas. When the manas's cognition transforms, when its views transform, when its wisdom transforms, the world of body and mind will correspondingly transform as well. The reactions of body and mind are the barometer of the manas: the venting of the manas's emotions, the expression of its thoughts, and so on are all revealed through the body and mind. If the manas's thinking undergoes some kind of shock, it will inevitably simultaneously drive and influence the world of body and mind, triggering a chain reaction throughout body and mind.