Paul, of all people, boasts in his weaknesses. He even writes that he “takes pleasure” in them, recognizing that when he is “weak, then [he] is strong.”
How is this possible? In weaknesses, strength is perfected through the grace afforded by Jesus Christ, the Holy Spirit, and God the Father — i.e. through the works and persons of the Godhead.
Paul claims that his physical [or perhaps psychological] weakness, his “thorn in the flesh” remains in order that he “not exalt [himself].” (2 Corinthians 12: 7) Within his weaknesses, including “insults, catastrophes, persecutions, and pressures,” Paul finds God’s “grace is sufficient for [him].”
Weakness remains in order that we not exalt ourselves, in order that we do not think more of ourselves than we ought.
Paul prays, “that the perception of your mind may be enlightened so that you may know what is the hope of His calling, what are the glorious riches of His inheritance among the saints, and what is the immeasurable greatness of His power to us who believe, according to the working of His vast strength.” (Ephesians 1: 18 – 19)