"When I dwell with my mind well-established in the four frames of reference, the pains that have arisen in the body do not invade or remain in the mind. Which four? There is the case where I remain focused on the body in & of itself -- ardent, alert, & mindful -- putting aside greed & distress with reference to the world. I remain 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. When I dwell with my mind well-established in these four frames of reference, the pains that have arisen in the body do not invade or remain in the mind."