Paul is still dealing with the fault in the church in Corinth which he first identified in 1 Corinthians 1:12. He has shown the nature of the deception involved.
Does a preacher notice that there are certain subjects connected with the gospel which he has begun to avoid? He is worried about putting people off with content that he knows they will despise as too much reliant on the supernatural, as requiring too great a change in the human heart, as avoiding the cross, the heart of the message. Then let his pray that God removes his foolishness and return to those subjects again. Of course the message must be well reasoned and interesting, but the preacher must honour God’s message and not obstruct the Spirit’s work.