"There are, O monks, these three feelings: pleasant, painful and neither-painful-nor-pleasant. Pleasant feelings should be known as painful, painful feelings should be known as a thorn, and neither-painful-nor-pleasant feelings should be known as impermanent. If a monk has known the feelings in such a way, it is said of him that he has the right outlook. He has cut off craving, severed the fetters (to existence) and, through the full penetration of conceit, he has made an end of suffering."