To set up on high - That is, who sets up on high; or God exalts those who are low. From the works of nature, Eliphaz passes to the dealings of God with people, as designed to show that he was worthy of confidence. The first proof is, that he showed himself to be the friend of the humble and the afflicted, and often exalted those who were in lowly circumstances, in a manner which evinced his direct interposition. It is to be remembered here, that Eliphaz is detailing the result of his own observation, and stating the reasons which he had observed for putting confidence in God; and the meaning here is, that he had so often seen this done as to show that God was the friend of the humble and the poor. This sentiment was afterward expressed with great beauty by Mary, the mother of the Lord Jesus:
He hath put down the mighty from their seats,
And exalted them of low degree;
He hath filled the hungry with good things,
And the rich he hath sent empty away.
Luke 1:52-53.
That those which mourn may be exalted to safety - Or rather, they who mourn are exalted to a place of safety, The sense is, that God did this; and that, therefore, there was ground of confidence in him. The word rendered "those which mourn" קדרים qoderı̂ym is from קדר qâdar, to be turbid or foul as a torrent, Job 6:16; hence, to go about in filthy garments, like mourners, to mourn. The general sense of the Hebrew word, as in Arabic, is to be squalid, dark, filthy, dusky, obscure; and hence, it denotes those who are afflicted, which is its sense here. The Septuagint renders it, ἀπολώλοτας apolōlotas, "the lost," or those who are perished. The sense is plain. God raises up the bowed down, the oppressed, and the afflicted. Eliphaz undoubtedly referred to instances which had come under his own observation, when persons who had been in very depressed circumstances, had been raised up to situations of comfort, honor, and safety: and that in a manner which was a manifest interposition of his Providence. From this he argued that those who were in circumstances of great trial, should put their trust in him. Cases of this kind often occur; and a careful observation of the dealings of God with the afflicted, would undoubtedly furnish materials for an argument like that on which Eliphaz relied in this instance.

To set up on high those that be low - He so distributes his providential blessings without partiality, that the land of the poor man is as well sunned and watered as that of the rich; so that he is thus set upon a level with the lords of the soil.

To set up on high those that be low,.... Not the low plants, which, through rain, are made to run up on high, though there is a truth in that; but husbandmen and gardeners, and such like persons, in low circumstances, who, by means of showers of rain, which make their gardens, fields, and lands fruitful, are raised to enjoy good estates, and large possessions:
that those which mourn may be exalted to safety; or "are black" (l), that are clothed in black, as a token of mourning; or whose faces are black with famine, see Lamentations 4:8; or are in very distressed circumstances, and black through poverty, as the Targum, and mourn over and grieve at their sad and deplorable case; those, through rain and fruitful seasons, are brought out of such an uncomfortable situation, and put into a better condition of life, where they are as in a fortress, out of the reach of such sad calamities: some connect the words with the following, that in order to do this, to raise up the humble and exalt mourners, "he disappoints the devices of the crafty", &c. Job 5:12.
(l) "denigrati", Montanus, Bolducius; "atrati", Cocceius, Schmidt, Michaelis; "pullati", Pagninus, Junius & Tremellius, Piscator, Mercerus, Beza; "sordidati", Schultens.

Connected with Job 5:9. His "unsearchable" dealings are with a view to raise the humble and abase the proud (Luke 1:52). Therefore Job ought to turn humbly to Him.

To set up - That is, he setteth up. Another example of God's great and wonderful works. He gives this instance to comfort and encourage Job to seek to God, because he can raise him out of his greatest depths.