I could not
This enjambment emphasizes the inability to speak: it’s as if there’s a stutter or hesitation built into the sentence. Note the trinity of negative words hereunder: not, neither, nothing.
This may also be an allusion to the Song of Songs — “I opened to my beloved; but my beloved had withdrawn himself, and was gone: my soul failed when he spake: I sought him, but I could not find him.”
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