Contradiction with John 15:5
Job 6:13 speaks of lacking strength within oneself, while John 15:5 suggests that strength comes from remaining in Christ, implying external reliance.
John 15:5: I am the vine, ye [are] the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing. [without me: or, severed from me]
Contradiction with Philippians 4:13
This verse asserts that one can do all things through Christ who strengthens them, contradicting Job's expression of personal powerlessness.
Philippians 4:13: I can do all things through Christ which strengtheneth me.
Contradiction with Isaiah 40:29
Job claims his strength is gone, but Isaiah 40:29 states that God gives power to the faint, which contradicts the idea of inherent weakness.
Isaiah 40:29: He giveth power to the faint; and to [them that have] no might he increaseth strength.