“Every moment the subatomic particles of which the body is composed arise and pass away. Every moment the mental functions appear and disappear, one after another. Everything inside oneself, physical and mental, just as in the world outside, is changing every moment. Previously, we may have known that this was true; we may have understood it intellectually. Now, however, by the practice of vipassanā-bhāvanā, we experience the reality of impermanence directly within the framework of the body. The direct experience of the transitory sensations proves to us our ephemeral nature.”