What does 1 Corinthians 9:7 mean?
Paul has asked if he has the right as an apostle to receive financial support from the people he serves. He has indicated that other apostles do this (1 Corinthians 9:4–6). He appears to be challenging the Corinthians for not supporting him with money. In truth, he has refused to take money from the people to whom he delivers the gospel.In order to make his greater point, Paul indicates this is unusual, almost unnatural. He makes this point in a series of questions: people in most professions receive pay for the work they do. No soldier pays his own way in a war. Nobody faults the vineyard worker for eating some of the fruit. No farmer refuses milk from the flock he tends.
The reason for this comparison is to support Paul's earlier teaching: that it is good for a Christian to give up their "rights" for the spiritual benefit of others (1 Corinthians 8:7–13). If Paul is willing to demonstrate this in such a dramatic way, the believers in Corinth have no excuse for not doing the same.