Qorintiyim Bĕt (2 Corinthians) 12:6-7

For if I shall wish to boast, I shall not be a fool, for I shall speak the truth. But I refrain, lest anyone should think more of me than what he sees in me, or hears of me. And to keep me from exalting myself because of the exceeding greatness of the revelations, a thorn in the flesh was given to me, a messenger of Satan to hit me, to keep me from exalting myself.