Contradiction with Philippians 3:3-4
Whereas 2 Corinthians 12:5 speaks about boasting in weaknesses, Philippians 3:3-4 emphasizes confidence in the flesh and personal achievements.
Philippians 3:3-4: For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh.
Contradiction with James 1:9-10
While 2 Corinthians 12:5 discusses rejoicing in one's weaknesses, James 1:9-10 advises the lowly to rejoice in their exaltation, contrasting the boasting in one's lowly state.
James 1:9-10: Let the brother of low degree rejoice in that he is exalted: [rejoice: or, glory]
Contradiction with Proverbs 27:2
This verse advises letting another praise you, not your own mouth, which contrasts with Paul's acknowledgment of boasting in 2 Corinthians 12:5.
Proverbs 27:2: Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
Contradiction with 2 Corinthians 10:17-18
While Paul in 12:5 contemplates boasting, these verses emphasize boasting in the Lord rather than in oneself, opposing the idea of self-boasting.
2 Corinthians 10:17-18: But he that glorieth, let him glory in the Lord.
Contradiction with Galatians 6:14
This verse states that one should boast only in the cross of Christ, contrasting the idea of boasting in personal weaknesses as mentioned in 2 Corinthians 12:5.
Galatians 6:14: But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world. [by whom: or, whereby]
Contradiction with 2 Corinthians 11:30
Although similar in mentioning boasting about weaknesses, the context here focuses more broadly on the folly of boasting, which can contrast the idea of any personal boasting in 12:5.
2 Corinthians 11:30: If I must needs glory, I will glory of the things which concern mine infirmities.