Job 36:30

He spreadeth his light upon it - Or, as Mr. Good translates, "He throweth forth from it his flash." These two verses may both have an allusion to the sudden rarefaction of that part of the atmosphere whence the thunder proceeds, by the agency of the electric fluid; the rushing in of the air on each side to restore the equilibrium, which the passage of the fire had before destroyed. The noise produced by this sudden rushing in of the air, as well as that occasioned by the ignition of the hydrogen gas, which is one of the constituents of water, is the thunder of his tabernacle, viz., the atmosphere, where God appears, in such cases, to be manifesting his presence and his power. Elihu says that God spreadeth his light upon it. This is spoken in reference to the flashes and coruscations of lightning in the time of thunder storms, when, even in a dark night, a sudden flash illuminates for a moment the surface of the earth under that place.

And covereth the bottom of the sea - He doth whatsoever it pleaseth him in the heavens above, in the earth beneath, in the sea, and in all deep places. Yea, the depths of the sea are as much under his control and influence as the atmosphere, and its whole collection of vapours, meteors, and galvanic and electric fluids.

Behold, he spreadeth his light upon it - That is, upon his tabernacle or dwelling-place - the clouds. The allusion is to lightning, which flashes in a moment over the whole heavens. The image is exceedingly beautiful and graphic. The idea of "spreading out" the light in an instant over the whole of the darkened heavens, is that which Elihu had in his mind, and which impressed him so forcibly. On the difficulty in regard to the translation of the Septuagint here, see Schleusner on the word ἡδὼ hēdō.

And covereth the bottom of the sea - Margin, "roots." The word roots is used to denote the bottom, as being the lowest part of a thing - as the roots of a tree. The meaning is that he covers the lowest part of the sea with floods of waters; and the object of Elihu is to give an exalted conception of the greatness of God, from the fact that his agency is seen in the higlest and the lowest objects. He spreads out the clouds, thunders in his tabernacle, diffuses a brilliant light over the heavens, and at the same time is occupied in covering the bottom of the sea with the floods. He is Lord over all, and his agency is seen every where. The highest and the lowest objects are under his control, and his agency is seen above and below. On the one hand, he covers the thick and dense clouds with light; and on the other, he envelopes the depth of the ocean in impenetrable darkness.

36:30 Light — The lightning; fitly God's light, because God only can light it.

It — Upon the cloud, which is in a manner the candlestick in which God sets up this light.

The sea — The lightning spreads far and wide over all the parts of the sea, and pierceth deep, reaching even to the bottom of it.