We walk with God in nobility of character because we are called to reflect Christ character. When we read the story of Job, we are reading a living testimony from the past, of someone who reflected Christ character by faith. As we learn of Christ, we see that He kept to His integrity even in the face of death, and so we are called to live out in our lives this nobility of character.
Job 2:3 And the LORD said unto Satan, Hast thou considered my servant Job, that [there is] none like him in the earth, a perfect and an upright man, one that feareth God, and escheweth evil? and still he holdeth fast his integrity, although thou movedst me against him, to destroy him without cause.