What now is Right Attentiveness? - The only way that leads to the attainment of purity, to the overcoming of sorrow and lamentation, to the end of pain and grief, to the entering upon the right path and the realization of Nibbana, is the Four Fundamentals of Attentiveness. And which are these four? There the disciple lives in contemplation of the Body, in contemplation of Feeling, in contemplation of the Mind, in contemplation of Phenomena, ardent, clearly conscious and attentive, after putting away worldly greed and grief.

(Buddha Sakyamuni)