He holdeth back the face of his throne - That is, he does not exhibit it - he covers it with clouds. The idea seems to be, that God sometimes comes forth and manifests himself to mankind, but that he comes encompassed with clouds, so that his throne cannot be seen. So in Psalms 18:11, “He made darkness his secret place, his pavilion round about him were dark waters and thick clouds of the skies.” God is often represented as encompassed with clouds, or as accompanied with tempests.
And spreadeth his cloud upon it - That is, so that it cannot be seen. There is much poetic beauty in this image. It is, that the clouds are made to conceal the splendor of the throne of God from the sight of man, and that all their sublimity and grandeur, as they roll on one another, and all their beauty when painted with so many colors in the evening, are designed to hide that throne from mortal eyes. No one sees God; and though it is manifest that he is every where employed, and that he comes forth with amazing grandeur in the works of creation and providence, yet he is himself invisible.