2 Corinthians 12:7-8

Because of the surpassing greatness and extraordinary nature of the revelations [which I received from God], for this reason, to keep me from thinking of myself as important, a thorn in the flesh was given to me, a messenger of Satan, to torment and harass me—to keep me from exalting myself! [Job 2:6] Concerning this I pleaded with the Lord three times that it might leave me