Attha-cariyā: Acting for another's benefit
One of the four ways of holding people together, this is work aimed at someone else's good. The prophets searched hard and were told the yield would go to strangers not yet born, like planting a tree you will never sit under. No thanks could reach back to them from people who did not exist, which leaves the labor with nothing in it for the laborer.
Dhamma-dāna: The gift of the teaching
Handing on the teaching outranks every other kind of giving. A sack of grain shrinks when it is shared, while this announcement, passed from prophets to preachers to the ones addressed, arrived whole at every stop. Food keeps someone alive another day; a message of this sort changes what they are.
Parato ghosa: The voice of another
Right view arises on two conditions, careful attention within and a voice from outside. The good news landed on these hearers because someone stood in front of them and said it aloud; sitting alone, they would still be waiting. Even the prophets did not invent it, and the chain of speaking runs down to ears that had not opened when it started.
Khaṇa: The opportune moment
The brief alignment when the teaching is being spoken and someone is present who can take it in. The prophets worked toward a season they never stood in, while the ones addressed are standing in it, the announcement already made and their hearing intact. Long stretches of history pass with nobody saying it and nobody ready, so such a window is worth everything while it holds.
Ehipassiko: Come and see
The teaching is open to inspection by anyone who cares to check it. Angels stooping to peer into these things are doing what the hearers may do at will, since none of it is locked away for higher beings or specialists. Ordinary people holding this in the open have what the shining ones lean in to glimpse.