12:7 So to keep me from becoming conceited because of the surpassing greatness of the revelations, a thorn was given me in the flesh, a messenger of Satan to harass me, to keep me from becoming conceited.
To prevent such spiritual pride from welling up in Paul, he was given a thorn in the flesh.
“to keep me from being conceited” – On the bright side, Paul fully understands the purpose of this “thorn” in his life. It was designed to keep him humbly dependent upon God’s grace as he lived and ministered under the gospel. The word conceited implies that that Paul might view himself as better than others, or that he might look down on others because they had not received the same spiritual experience he had.