Glenn, I think it helps a lot to have "only" in the next-to-last line. It picks up the insistence on only one in the first line. There is a force to that insistence that I think adds a lot to the tone of the poem. I think you are wrong about "know" and "understand" meaning exactly the same thing. People know many facts that they do not understand. But go with whichever word you like.
Susan
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