Renunciation

"How is one guarded as to the doors of one's senses? (1. The senses are considered metaphorically as so many doors through which impressions enter the mind.) Having perceived a form with one's eye, one does not fasten on its general appearance, or on its secondary characteristics. (2. In other words, one does not allow oneself to become fascinated by it, or by any aspect of it, or to feel that it is "mine." One simply watches with equanimity as phenomena come and go.) As long as one lived with one's faculty of sight unrestrained, one fell prey to craving and unhappiness, to evil and unskilled states of mind. So one undertakes restraint, watching over one's faculty of sight and restraining it. (And similarly with the other faculties: hearing, smelling, tasting, touching, and cognizing things with the mind.) One, possessed of this noble restraint of the faculties, experiences unalloyed happiness within oneself. And how is one mindful and aware? One, in going forth or returning, is clearly aware of one's action. So also when looking ahead or looking around, when bending one's arm in or stretching it out, when wearing one's clothes or carrying one's bowl, when eating, drinking, chewing or tasting, when defecating or urinating, when walking, standing, sitting, sleeping, waking, speaking or keeping silent; in all this one is clearly aware of what one is doing. Thus is one mindful and aware."

http://www.accesstoinsight.org/lib/authors/prince/bl036.html