2 Corinthians 12:6-7

For even though I am willing to glory, I will not be foolish. But I will speak the truth. Yet I will do so sparingly, lest anyone may consider me to be anything more than what he sees in me, or anything more than what he hears from me. And lest the greatness of the revelations should extol me, there was given to me a prodding in my flesh: an angel of Satan, who struck me repeatedly.