The answer
Job was a humble man and not self-righteous. It is sufficient that God attested to Job’s righteousness, Himself, against Satan in Job's defense (Job 2:3):Then the Lord said to Satan, “Have you considered My servant Job, that there is none like him on the earth, a blameless and upright man, one who fears God and shuns evil? And still he holds fast to his integrity, although you incited Me against him, to destroy him without cause.”
Answered by His Eminence Metropolitan Youssef (opens in a new tab)