John Gill Commentary Job 37:18

"Canst thou with him spread out the sky, Which is strong as a molten mirror?" — Job 37:18 (ASV)

Have you with him spread out the sky ?
&c.] Were you concerned with him at the first spreading out of the sky? were you an assistant to him in it? did he not spread it as a curtain or canopy about himself, without the help of another? verily he did; see (Job 9:8) (Isaiah 44:24) ;

[which] is strong :
for though it seems a fluid and thin, is very firm and strong, as appears by what it bears, and are contained in it; and therefore is called "the firmament of his power", (Psalms 150:1) ;

[and] as a molten looking glass ;
clear and transparent, like the looking glasses of the women, made of molten brass, (Exodus 38:8) ; and firm and permanent ^F21 ; and a glass this is in which the glory of God, and his divine perfections, is to be seen; and is one of the wondrous works of God, made for the display of his own glory, and the benefit of men, (Psalms 19:1) . Or this may respect the spreading out a clear serene sky, and smoothing it after it has been covered and ruffled with storms and tempests; which is such a wonderful work of God, that man has no hand in.

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FOOTNOTES:

• F21: (calkeov ouranov) . Pindar. Nem. Ode 6.