But how, o Monks, must inhalation and exhalation be practiced and cultivated introspectively that it causes high recompense, high advancement? "A monk, o Monks, goes into a forest, or to the foot of a great tree, or to a lonely place, and there sits down, cross-legged, holding his body upright, and practices Introspection. "He breathes in attentively, and attentively breathes out.

(Buddha Sakyamuni)