What does it mean when Paul says in 1 Corinthians 3:6, "I have planted, Apollos watered; but God gave the growth"?
I think what 1 Cor 3:6 is saying is that there is some instrumental causality that can be attributed to us, when we do the good work of proclaiming the Gospel and bringing people to Christ. But, the first cause is always God. He is the unseen force behind every good thing, and any fruit that comes from our work should ultimately be attributed to Him.
Paul is pointing this out to the Corinthians b/c they were getting too caught up in the man and were forgetting the God behind the man. Jealousy and strife was being stirred among them based on who exactly it was who taught each one of them, as if one group was better than the other b/c they learned from Paul instead of Apollos.
I hope that helps.