Bodhisatta: A being bound for awakening
A bodhisatta is one on the long road to awakening, taking birth among beings again and again. The obligation is owed to a purpose accepted beforehand, so a mother's womb, an empty stomach, and a body that tires arrive as its terms. Nobody hands this necessity down from above; the errand sets its own price.
Samānattatā: Equal footing
Samānattatā is standing on the same level as the people you mean to help, one of the four practices that hold a community together. "In all things" leaves no seat reserved: the same weariness, the same fear in the dark, the same death, for the one who has just called them brothers. A helper who keeps back a single privilege stays an outsider, and people can feel it.
Dukkha: Suffering
Dukkha is the ache running through everything that ages, breaks, and ends. Likeness to the brothers means carrying that ache firsthand: an empty stomach, a sleepless night, the fear before dying. A doctor who has had the illness listens differently from one who has only read the chart.
Karuṇā: Compassion
Karuṇā is the heart moving toward another's pain. Mercy in this priest grew in a shared body: he has been where they are, so their trouble reaches him before they can explain it. Pity watches from the bank; karuṇā is already in the water.
Kalyāṇamitta: Good friend
A kalyāṇamitta is the admirable friend on whom another's whole practice can rest. Faithfulness here is plain reliability: he keeps his post in the things of God, and the people can count on the same one who wore their flesh to be standing there. Someone who has gone ahead on the road and come back for you is worth following.
Pattidāna: Sharing of merit
Pattidāna is turning the good of your own deed over to someone else, as families do when they dedicate an offering to the dead. Atonement runs on similar wiring: one person's work counted for a whole people who did none of it. The direction reverses here, since he takes up their debt instead of passing down his credit, and in the Pali texts a deed still ripens on the one who did it.