"This is what happens to anyone who wanders into what is not his proper range and is the territory of others.
"For this reason, you should not wander into what is not your proper range and is the territory of others. In one who wanders into what is not his proper range and is the territory of others, Mara gains an opening, Mara gains a foothold. And what, for a monk, is not his proper range and is the territory of others? The five strands of sensuality. Which five? Forms cognizable by the eye -- agreeable, pleasing, charming, endearing, fostering desire, enticing. Sounds cognizable by the ear...Aromas cognizable by the nose...Flavors cognizable by the tongue...Tactile sensations cognizable by the body -- agreeable, pleasing, charming, endearing, fostering desire, enticing. These, for a monk, are not his proper range and are the territory of others.
"Wander, monks, in what is your proper range, your own ancestral territory. In one who wanders in what is his proper range, his own ancestral territory, Mara gains no opening, Mara gains no foothold. And what, for a monk, is his proper range, his own ancestral territory? The four frames of reference. Which four? There is the case where a monk remains focused on the body in & of itself -- ardent, alert, & mindful -- putting aside greed & distress with reference to the world. He remains focused on feelings in & of themselves...mind in & of itself...mental qualities in & of themselves -- ardent, alert, & mindful -- putting aside greed & distress with reference to the world. This, for a monk, is his proper range, his own ancestral territory."