Dhammānudhamma-paṭipatti: Practice in Line with the Truth
Practice that matches the truth a person has accepted. Obedience of this kind is truth carried into the feet: something was heard, and the hearing was walked, which is why the purifying is spoken of as already done. Agreeing that a road is the right one while staying home is not obedience to it.
Visuddhi: Purification
Cleanness of mind, stain by stain. These souls have already been washed, and the washing is what makes the command that follows carryable, since a heart crowded with grudges and quiet accounting has little left to pour out. You rinse the cup before you fill it.
Ajjava: Uprightness
Straightness in a person, no crook in the line. Affection that is sincere has nothing folded behind it, no second purpose kept in the pocket while the face smiles. Among scattered households depending on each other for bread and a roof, warmth performed for advantage would rot the whole arrangement within a month.
Kalyāṇamittatā: Good Friendship
Companionship with those who hold you to the path. Brotherly affection binds people who share one truth, so what is asked here is not broad goodwill toward humanity but the concrete work of standing by the person in the next house. These exiles had no city wall or family name supplying the bond; it had to be chosen and kept.
Mettā: Loving-Kindness
Goodwill that wishes another well and keeps wishing it. Loving from the heart points to where the warmth starts, underneath the manners that get people through a shared meal, so it still holds when the other person is tiresome or wrong. Mettā trains like a muscle: you extend it toward the ones who make extending it hard.
Viriya: Energy
Effort applied and reapplied. Love at full stretch costs something, since affection cools on its own the way a fire dies down when nobody adds wood. Fervently is the instruction to keep adding wood, especially toward the neighbor who has been difficult all year.