Wow, the dynamics of that are really interesting, Rogerbob.
L1's twinned "must" (showing the speaker's helplessness) quickly becomes "let him" (showing the speaker's assertion of godlike control). Note how perfectly the sunlit L3 echoes the "Let there be light" of Genesis.
This, in turn, associates speech itself--whether in Genesis or in this poem--with the power to create the universe anew, as the speaker is now doing, displacing the Creator by not letting Him speak. By L6, even the word "must" itself has transformed from L1's expression of reluctant acceptance into yet another expression of the speaker's verbal power. God's silence becomes implicit acceptance of the universe-ruling narrator's commands.
[I wrote much more on this, but then decided that not everyone will be inclined to sit still for a sermon in the Church of Julie, so PM me if you want a bigger dose of my theological blather.]
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