Having a consciousness and awareness, knowing inside and outside, a person sometimes knows only outside, but not reaching their deeply inside. “The four Application of Mindfulness” which are contemplation of the body, contemplation of sensation, contemplation of mind, and contemplation of condition is to consider and perceive the body is only a natural element. Seeing earth (soil), water, air, and fire in the image of two forms, which are beautiful and unpleasant of a body, these are called corpses of humans.