Charles H. Spurgeon on Psalms 104:2

Who coverest thyself with light as with a garment. In comparing the light with which he represents God as arrayed to a garment, he intimates, that although God is invisible, yet his glory is conspicuous enough. In respect of his essence, God undoubtedly dwells in light that is inaccessible; but as he irradiates the whole world by his splendour, this is the garment in which he, who is hidden in himself, appears in a manner visible to us. The knowledge of this truth is of the greatest importance. If men attempt to reach the infinite height to which God is exalted, although they fly above the clouds, they must fail in the midst of their course. Those who seek to see him in his naked majesty are certainly very foolish. That we may enjoy the sight of him, he must come forth to view with his clothing; that is to say, we must cast our eyes upon the very beautiful fabric of the world in which he wishes to be seen by us, and not be too curious and rash in searching into his secret essence. Now, since God presents himself to us clothed with light, those who are seeking pretexts for their living without the knowledge of him, cannot allege in excuse of their slothfulness, that he is hidden in profound darkness. When it is said that the heavens are a curtain, it is not meant that under them God hides himself, but that by them his majesty and glory are displayed, being, as it were, his royal pavilion. John Calvin.