Pahāna: Abandoning
Abandoning is the deliberate cutting off of an unwholesome state once it has arisen. The killing ordered here falls on the grasping, not on the hand that grasps; a hand only does what the wanting tells it. Because the dying has already happened and the life is hidden away safe, this is weeding by the root, going after whatever keeps sending up the shoot.
Indriyasaṃvara: Guarding the sense doors
Guarding the sense doors is watchfulness at eye, ear, and the rest as impressions come in. The members on the earth are those gates: what the eye lingers on, what the hand closes around, where the feet carry you at night. Nobody puts a gate to death. You post someone at it, and the traffic that used to pour through narrows to what you let in.
Kāmarāga: Sensual lust
Sensual lust is the mind's heat toward pleasing sights, sounds, and touch. Sexual immorality, uncleanness, depraved passion, evil desire: one fever with four names, counted out slowly so it cannot be mistaken for four small separate troubles. The heat is hottest in the rehearsing, long before any body is involved, so the killing has to reach the room where the picture is kept.
Abhijjhā: Covetousness
Covetousness is greed leaning toward what belongs to somebody else. It comes last and quietest, the one you can practice all day alone in a room and never be caught at. The eye rests on a neighbor's house or wife or easier life and starts arranging how it might come over here, and the arranging is already the deed done.
Upādāna: Clinging
Clinging is the grip that will not open, and the word also means fuel. Calling covetousness idolatry marks the moment wanting stops being appetite and turns into worship: the thing is bowed to, consulted, trusted to deliver what it cannot. Held tightly enough, a house or a body becomes a small god, and the holding is what keeps it alive, the way a fire lives on the wood you keep handing it.