Contradiction with Matthew 6:1
This verse contradicts Ephesians 6:7 by advising against doing good deeds to be seen by others, while Ephesians 6:7 emphasizes doing service wholeheartedly as to the Lord.
Matthew 6:1: Take heed that ye do not your alms before men, to be seen of them: otherwise ye have no reward of your Father which is in heaven. [alms: or, righteousness] [of your: or, with your]
Contradiction with Colossians 3:23
While this verse is similar in message to Ephesians 6:7, some may interpret it as focusing more on working as though accountable directly to God, which could be seen as a contradictory emphasis when considering intentions behind actions.
Colossians 3:23: And whatsoever ye do, do [it] heartily, as to the Lord, and not unto men;
Contradiction with Matthew 23:5
This verse contradicts Ephesians 6:7 by criticizing actions done to be observed by others, whereas Ephesians 6:7 encourages serving as if serving the Lord, which inherently is not for human approval but can be perceived differently.
Matthew 23:5: But all their works they do for to be seen of men: they make broad their phylacteries, and enlarge the borders of their garments, [phylacteries: pieces of parchment containing sentences of the law]
Contradiction with Philippians 2:21
This verse contrasts with Ephesians 6:7 by suggesting that people often seek their own interests rather than serving with sincerity as directed in Ephesians.
Philippians 2:21: For all seek their own, not the things which are Jesus Christ's.
Paradox #1
Ephesians 6:7 encourages serving others wholeheartedly, as if serving the Lord. A moral conflict could arise if this is seen as encouraging unquestioning obedience, even in unjust situations. Some might argue this promotes a form of servitude without questioning authority, which could be morally troubling if the authority is corrupt or unjust.