"Rahula, develop the meditation in tune with earth. For when you are developing the meditation in tune with earth, agreeable & disagreeable sensory impressions that have arisen will not stay in charge of your mind. Just as when people throw what is clean or unclean on the earth — feces, urine, saliva, pus, or blood — the earth is not horrified, humiliated, or disgusted by it; in the same way, when you are developing the meditation in tune with earth, agreeable & disagreeable sensory impressions that have arisen will not stay in charge of your mind.
Bhikkhu, Thanissaro. "Maha-Rahulovada Sutta." Access to Insight. N.p., 2006. Web. 9 Dec 2010. .