Oh that thou wouldest rend the heavens, that thou wouldest come down, that the mountains might flow down at thy presence, O that thou wouldest rend the heavens - This seems to allude to the wonderful manifestation of God upon Mount Sinai.
Related Commentaries of Isaiah 64:1
Isaiah 64:1
1 Oh that thou wouldest rend the heavens, that thou wouldest come down, that the mountains might flow down at thy presence,