Could mortal lip divine — Moses

Could mortal lip divine 1
The undeveloped Freight
Of a delivered syllable
'Twould crumble with the weight.
(F.1456/J.1409)
[1] mortal lip divine:: a human who spoke for God.
[2] Freight:: burden, the Ten Commandments to follow.
[3] delivered syllable:: a speech.
[4] crumble:: Moses "cast the tables out of his hands, and brake them beneath the mount." (Ex odus 32:19)