Romans 11:33

The apostle having insisted so largely, through the greatest part of this chapter, upon reconciling the rejection of the Jews with the divine goodness, he concludes here with the acknowledgment and admiration of the divine wisdom and sovereignty in all this. Here the apostle does with great affection and awe adore, I. The secrecy of the divine counsels: O the depth! in these proceedings towards the Jews and Gentiles; or, in general, the whole mystery of the gospel, which we cannot fully comprehend. - The riches of the wisdom and knowledge of God, the abundant instances of his wisdom and knowledge in contriving and carrying on the work of our redemption by Christ, a depth which the angels pry into, Pe1 1:12. Much more may it puzzle any human understanding to give an account of the methods, and reasons, and designs, and compass of it. Paul was as well acquainted with the mysteries of the kingdom of God as ever any mere man was; and yet he confesses himself at a loss in the contemplation, and, despairing to find the bottom, he humbly sits down at the brink, and adores the depth. Those that know most in this state of imperfection cannot but be most sensible of their own weakness and short-sightedness, and that after all their researches, and all their attainments in those researches, while they are here they cannot order their speech by reason of darkness. Praise is silent to thee, Psa 65:1.

— Matthew Henry's Concise Commentary (public domain)

Oh, the depth, &c.--The apostle now yields himself up to the admiring contemplation of the grandeur of that divine plan which he had sketched out. of the riches both of the wisdom and knowledge of God--Many able expositors render this, "of the riches and wisdom and knowledge," &c. [ERASMUS, GROTIUS, BENGEL, MEYER, DE WETTE, THOLUCK, OLSHAUSEN, FRITZSCHE, PHILIPPI, ALFORD, Revised Version]. The words will certainly bear this sense, "the depth of God's riches." But "the riches of God" is a much rarer expression with our apostle than the riches of this or that perfection of God; and the words immediately following limit our attention to the unsearchableness of God's "judgments," which probably means His decrees or plans (Psa 119:75), and of "His ways," or the method by which He carries these into effect. (So LUTHER, CALVIN, BEZA, HODGE, &c.). Besides, all that follows to the end of the chapter seems to show that while the Grace of God to guilty men in Christ Jesus is presupposed to be the whole theme of this chapter, that which called forth the special admiration of the apostle, after sketching at some length the divine purposes and methods in the bestowment of this grace, was "the depth of the riches of God's wisdom and knowledge" in these purposes and methods. The "knowledge," then, points probably to the vast sweep of divine comprehension herein displayed; the "wisdom" to that fitness to accomplish the ends intended, which is stamped on all this procedure.

— Jamieson-Fausset-Brown Commentary (public domain)