Sforno on Exodus 20:19/ספורנו על שמות כ׳:י״ט

1אתם ראיתם כי מן השמים דברתי עמכם, we need to understand this in terms of Psalms 113, 5-6 המגביהי לשבת המשפילי לראות, “enthroned on high, sees what is below, in heaven and on earth.” [The psalmist does not perceive of heaven and earth as being two totally separate domains being separated by some sort of impenetrable barrier making it necessary for G’d to come to earth to see what is going on down here. Seeing that the whole universe is full of His glory at all times, this would be impossible. Rather, He perceives of a gradual transition between the two domains, without any visible void or barrier between them. G’d’s raising men or “lowering” Himself, is a figure of speech, describing merely that when He so wants it both domains can merge. At the revelation of Mount Sinai, such a merging of these domains had taken place. Ed.]