Contradiction with Matthew 5:44
Encourages love and blessing opponents, while 2 Corinthians 11:12 seeks to undermine them.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Romans 12:14
Advises to bless those who persecute, unlike 2 Corinthians 11:12's approach to opposition.
Romans 12:14: Bless them which persecute you: bless, and curse not.
Contradiction with 1 Peter 3:9
Urges not repaying evil with evil or insult with insult, contrasting with the intent in 2 Corinthians 11:12.
1 Peter 3:9: Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.
Contradiction with James 4:11
Cautions against speaking evil of one another, but 2 Corinthians 11:12 involves a competitive stance.
James 4:11: Speak not evil one of another, brethren. He that speaketh evil of [his] brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge.
Contradiction with Proverbs 24:17
Advises not rejoicing when your enemy falls, differing from the strategy in 2 Corinthians 11:12.
Proverbs 24:17: Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth: