2 Corinthians 12:6-7

For if I would desire to boast, I will not be foolish; for I will speak the truth. But I refrain, so that no man may think more of me than that which he sees in me or hears from me. By reason of the exceeding greatness of the revelations, that I should not be exalted excessively, a thorn in the flesh was given to me: a messenger of Satan to torment me, that I should not be exalted excessively.