Contradiction with Proverbs 27:2
Emphasizes letting others praise you instead of praising yourself, which contrasts with the self-promotion aspect in 2 Corinthians 11:30.
Proverbs 27:2: Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
Contradiction with Matthew 6:2
Advises against seeking glory for oneself, contrasting with boasting about weaknesses publicly as seen in 2 Corinthians 11:30.
Matthew 6:2: Therefore when thou doest [thine] alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, They have their reward. [do not...: or, cause not a trumpet to be sounded]
Contradiction with Philippians 2:3
Urges humility over self-promotion, which seems at odds with the boasting mentioned in 2 Corinthians 11:30.
Philippians 2:3: [Let] nothing [be done] through strife or vainglory; but in lowliness of mind let each esteem other better than themselves.
Contradiction with James 4:16
Describes boasting and pride as evil, which can be seen as contradictory to boasting about weaknesses encouraged in 2 Corinthians 11:30.
James 4:16: But now ye rejoice in your boastings: all such rejoicing is evil.