"In Your Investigation of the World"
"In your investigation of the world, never allow the mind to desert the body. Examine its nature, see the elements that compose it, see the impermanence, the suffering, the selflessness of the body while sitting, standing, walking, or lying down. When its true nature is seen fully and lucidly by the heart, the wonders of the world will become clear. In this way the purity of mind can shine forth, timeless and delivered. ~Ahahn Mun
About Ajahn Mun (from a book page at Amaravati.org)