We just learned about Paul's First Letter to the Corinthians.
Paul wrote two letters to the church in Corinth, so there is a Second Letter to the Corinthians.
This second letter mostly gives instructions to the church about how to collect money for the poor.
There is a common saying of: You reap what you sow.
That is a farming saying that means if you plant a lot of seeds then you will get a lot of crops, but if you don't plant many seeds you won't get many crops.
It's a way to tell people that if they helped poor people by giving to them, then they would be rewarded with many gifts by God.
(from: wikipedia - harvest)
Kid Facts - Blast from the past: Parable of the Weeds