Which doeth great things past finding out; yea, and wonders without number.

Wesley's Notes

9:10 Doth great things, and c. - Job here says the same that Eliphaz had said, chap.5:9, and in the original, in the very same words, with design to shew his full agreement with him, touching the Divine perfections.

Jamieson-Fausset-Brown Bible Commentary

10. Repeated from Eliphaz (Job 5:9).

Matthew Henry's Concise Commentary

9:1-13 In this answer Job declared that he did not doubt the justice of God, when he denied himself to be a hypocrite; for how should man be just with God? Before him he pleaded guilty of sins more than could be counted; and if God should contend with him in judgment, he could not justify one out of a thousand, of all the thoughts, words, and actions of his life; therefore he deserved worse than all his present sufferings. When Job mentions the wisdom and power of God, he forgets his complaints. We are unfit to judge of God's proceedings, because we know not what he does, or what he designs. God acts with power which no creature can resist. Those who think they have strength enough to help others, will not be able to help themselves against it.