"Just as the royal frontier fortress has a gatekeeper—wise, experienced, intelligent—to keep out those he doesn’t know and to let in those he does, for the protection of those within and to ward off those without; in the same way a disciple of the noble ones is mindful, highly meticulous, remembering and able to call to mind even things that were done and said long ago. With mindfulness as his gatekeeper, the disciple of the noble ones abandons what is unskillful, develops what is skillful, abandons what is blameworthy, develops what is blameless, and looks after himself with purity."As Jane goes on tripping over shrapnel from last week's mayhem. Huh boy.
—Anguttara Nikaya 7.63