Bildad argues that sin leads to suffering, and so Job must repent.  Job again claims his innocence, wondering who can contend against God.  He feels as if God is contending against him.  Observe:

• Great God – Job wonders how he can contend with God, going on to describe God’s greatness in his control over creation. Wander outside and ponder God’s great power over creation.
• Mediator – Job longs for a mediator between God and himself (9:33). Jesus came to be that mediator (I Timothy 2:5) through whom we can approach God.