He — He is infinitely wise, and searcheth all mens hearts and ways, and discovers a multitude of sins which mens short sighted — eyes cannot see; and therefore can charge them with innumerable evils, where they thought themselves innocent, and sees far more malignity than men could discern in their sins. Mighty — So that whether men contend with God by wisdom or by strength: God will be conqueror. Hardened himself — Obstinately contended with him. The devil promised himself that Job in the day of his affliction, would curse and speak ill of God. But instead of that, he sets himself to honour God, and speak highly of him. As ill pained as he is, and as much as he is taken up with his own miseries, when he has occasion to mention the wisdom and power of God, he forgets his complaints and expatiates with a flood of eloquence on that glorious subject.
Related Commentaries of Job 9:4
Job 9:4
4 He is wise in heart, and mighty in strength: who hath hardened himself against him, and hath prospered?