Thought from Today’s Old Testament Passage:
[Psalm 104] He stretches out the heavens like a curtain, v. 2. So he did at first, when he made the firmament, which in the Hebrew has its name from its being expanded, or stretched out, Gen. 1:7. He made it to divide the waters as a curtain divides between two apartments. So he does still: he now stretches out the heavens like a curtain, keeps them upon the stretch, and they continue to this day according to his ordinance. The regions of the air are stretched out about the earth, like a curtain about a bed, to keep it warm, and drawn between us and the upper world, to break its dazzling light; for, though God covers himself with light, yet, in compassion to us, he makes darkness his pavilion. Thick clouds are a covering to him. The vastness of this pavilion may lead us to consider how great, how very great, he is that fills heaven and earth. He has his chambers, his upper rooms (so the word signifies), the beams whereof he lays in the waters, the waters that are above the firmament (v. 3), as he has founded the earth upon the seas and floods, the waters beneath the firmament. Though air and water are fluid bodies, yet, by the divine power, they are kept as tight and as firm in the place assigned them as a chamber is with beams and rafters. How great a God is he whose presence-chamber is thus reared, thus fixed!
Matthew Henry, Matthew Henry’s Commentary on the Bible (Peabody MA: Hendrickson Publishers), 1997