I’ve linked to this before, but this is a nearly hour-long conversation between Don Carson, John Piper, and Tim Keller.
Greg Gilbert just transcribed a very helpful section where Piper and Keller answer Carson’s question:
If we should be involved in [mercy ministries], what safeguards can we introduce so that we don’t fall into the traps that have historically taken place?
Read their answers here. Or again, listen to the whole thing.