(15) Light of His cloud--i.e., lightning, as before. "Dost thou know all the secrets of God's thunderbolts, at whom and how He will use them?" Some understand this otherwise: "Dost thou know when God setteth the sun over them (the clouds), and causeth the light (i.e., the sun) to shine upon His cloud?" i.e., "Dost thou know how God useth the sun to disperse the clouds?"

Verse 15. - Dost thou know when God disposed them; rather, disposes them - gives them their orders, arranges for their course and sequence? Or dost thou know when he caused (or rather, causes) the light of his cloud (either the lightning, or perhaps the rainbow, as Schultens suggests) to shine Thou canst not pretend to any such knowledge.

37:14-20 Due thoughts of the works of God will help to reconcile us to all his providences. As God has a powerful, freezing north wind, so he has a thawing, composing south wind: the Spirit is compared to both, because he both convinces and comforts, So 4:16. The best of men are much in the dark concerning the glorious perfections of the Divine nature and the Divine government. Those who, through grace, know much of God, know nothing, in comparison with what is to be known, and of what will be known, when that which is perfect is come.Dost thou know when God disposed them?.... The clouds, that part of the wondrous works of God he was speaking of; when he decreed concerning them that they should be, when he put into them and stored them with rain, hail, snow, &c. disposed of them here and there in the heavens, and gave them orders to fall on this and the other spot of ground; wast thou present at all this, and knew what God was doing secretly in the clouds, and before heard what would break out of them, or fall from them? and if thou art ignorant of these things, canst thou imagine that thou shouldest be made acquainted with the secret springs of God's providential dealings with the children of men?

and caused the light of his cloud to shine; either the lightning to break through the cloud, or rather the light of the sun to shine upon his cloud, prepared to receive the light reflected on it, and form the rainbow; which, as it is called his bow, the cloud in which it is may be called his cloud; which is one of the wondrous works of God, and is called by the Heathens the daughter of wonder (u); formed in a semicircle, with various colours, and as a token that God will drown the earth no more; an emblem of the covenant of peace, and of Jesus Christ, said to be clothed with a cloud, and with a rainbow about his head, Revelation 10:1.

(u) Apollodorus, l. 1. p. 5.