Contradiction with Ecclesiastes 9:10
Encourages diligence in whatever task is undertaken, which could be seen as aligning with rather than contradicting 2 Thessalonians 3:13.
Ecclesiastes 9:10: Whatsoever thy hand findeth to do, do [it] with thy might; for [there is] no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.
Contradiction with Galatians 6:9
Similar to 2 Thessalonians 3:13, it advises not growing weary in doing good, so it doesn't necessarily contradict but rather reinforces the message.
Galatians 6:9: And let us not be weary in well doing: for in due season we shall reap, if we faint not.
Contradiction with Matthew 5:39
Suggests turning the other cheek and not resisting evil, which might contradict the overarching perseverance theme in 2 Thessalonians 3:13 by advocating a passive response.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Proverbs 26:4
Advises not to answer a fool according to his folly, which can implicitly suggest a limit to doing good, possibly seen contrary to persistent good doing in all circumstances.
Proverbs 26:4: Answer not a fool according to his folly, lest thou also be like unto him.
Contradiction with Luke 14:26
Speaks of hating one's own family for Christ's sake, presenting a potential contradiction with the emphasis on continually doing good as per Paul's teachings.
Luke 14:26: If any [man] come to me, and hate not his father, and mother, and wife, and children, and brethren, and sisters, yea, and his own life also, he cannot be my disciple.
Contradiction with Ecclesiastes 3:1
Indicates there is a time for every purpose, which might imply there is also a time to stop doing good, contrasting with the idea of never being weary in goodness.
Ecclesiastes 3:1: To every [thing there is] a season, and a time to every purpose under the heaven: