Note 19 at 2 Cor. 11:12: Paul's motive for not receiving personal offerings from the Corinthians was to stop criticism of him and the gospel he preached. He gave such a selfless example by the way that he conducted himself financially, that it would be inconceivable that anyone could successfully oppose him. These false apostles (v. 13) who had challenged him were not refusing financial aide from the Corinthians. If the Corinthians would have cut off support to these false apostles, they would have gone on to greener pastures. They were not true to God, but only to themselves. Their greed proved it.

Paul is saying, "If anyone wants to criticize me, let him live like me- refusing to receive gifts." Paul knew that would silence his opponents.