Job 28:20

The question which Job had asked (Job 28:12) he asks again here; for it is too worthy, too weighty, to be let fall, until we speed in the enquiry. Concerning this we must seek till we find, till we get some satisfactory account of it. By a diligent prosecution of this enquiry he brings it, at length, to this issue, that there is a twofold wisdom, one hidden in God, which is secret and belongs not to us, the other made known by him and revealed to man, which belongs to us and to our children. I. The knowledge of God's secret will, the will of his providence, is out of our reach, and what God has reserved to himself. It belongs to the Lord our God. To know the particulars of what God will do hereafter, and the reasons of what he is doing now, is the knowledge Job first speaks of. 1. This knowledge is hidden from us. It is high, we cannot attain unto it (Job 28:21, Job 28:22): It is hid from the eyes of all living, even of philosophers, politicians, and saints; it is kept close from the fowls of the air; though they fly high and in the open firmament of heaven, though they seem somewhat nearer that upper world where the source of this wisdom is, though their eyes behold afar off (Job 39:29), yet they cannot penetrate into the counsels of God.

— Matthew Henry's Concise Commentary (public domain)

job 28:20Job 28:12 repeated with great force.

— Jamieson-Fausset-Brown Commentary (public domain)