Contradiction with Matthew 5:44
Jesus teaches to love and pray for enemies, while 2 Timothy 4:14 is about the Lord repaying for wrongs.
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 12:19
Encourages not taking revenge and leaving it to God's wrath, unlike the tone in 2 Timothy 4:14 which mentions requital.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Contradiction with Proverbs 20:22
Advises against saying you will recompense evil, differing from 2 Timothy 4:14 sentiments on repayment.
Proverbs 20:22: Say not thou, I will recompense evil; [but] wait on the LORD, and he shall save thee.
Contradiction with 1 Peter 3:9
Instructs not to repay evil for evil, conflicting with the implication in 2 Timothy 4:14.
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.