2 Corinthians 12:6-7

Although if I should wish to boast, I would not be foolish, for I would be telling the truth. But I refrain, so that no one may think more of me than what he sees in me or hears from me because of the abundance of the revelations. Therefore, that I might not become too elated, a thorn in the flesh was given to me, an angel of Satan, to beat me, to keep me from being too elated.