Michael - ditto with Strurmy,
The context for these remarks is a video produced by Piper against the Health, Wealth and Properity Gopspel. I have some sympahty for him in his feelings about this. You can find the speech here
awkwardmomentsbible.com/john-piper-dead-kid/
and here
rfforum.websitetoolbox.com/post?id=5458896
However the remarks about suffering for God, and rejoicing in suffering (rather than expecting prosperity) are masochistic in the extreme. Do they really motivate people to want to alleviate suffering. They are also sadistic - the corollary of Pipers beliefs is that he does not know that his hypothetical little girl is one of the elect and will one day see fit to rejoice that God has damned her if this is God’s will. Of course some times people can be a lot better than the beliefs they hold. But I don’t think this video with what seems to me its crass, slick production is going to get anyone to rethink attitudes about prosperity - quite the opposite.