Contradiction with Jeremiah 51:30
Isaiah 42:4 speaks of perseverance and not failing, whereas Jeremiah 51:30 describes the warriors as having ceased to fight and having become like women, indicative of failure.
Jeremiah 51:30: The mighty men of Babylon have forborn to fight, they have remained in [their] holds: their might hath failed; they became as women: they have burned her dwellingplaces; her bars are broken.
Contradiction with Mark 14:36
Isaiah 42:4 speaks of determination and not failure, whereas Mark 14:36 shows Jesus expressing a desire for the cup of suffering to pass, indicating a struggle between human will and divine mission.
Mark 14:36: And he said, Abba, Father, all things [are] possible unto thee; take away this cup from me: nevertheless not what I will, but what thou wilt.
Contradiction with Galatians 6:9
Isaiah 42:4 talks about establishing justice without failure, while Galatians 6:9 warns against becoming weary in doing good, implying that weariness and giving up can be a part of human experience.
Galatians 6:9: And let us not be weary in well doing: for in due season we shall reap, if we faint not.