The combination of m-dash and colon (which have the same function) leaves the sentence structure a little muddy for the reader. I suggest recasting. To write poems that endure, we should be certain of two things: that in all likelihood we will fail, and that if we succeed we will never know it.
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Mister Micawberm-dash and colon (which have the same function)Right. They have the same function; a paraphrase comes after/before them.
TakaGrammatically, is it still safe to say that the infinitive 'to desire...' is a paraphrase of 'such a goal'?I think we must.