Not time
Nor tide
Not even life
Nothing lasts forever
...
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I love it! It's great the way your asking question to the reader that makes them think, and i like your use to say nothings lasts for ever in a negative way to describe happiness, but then you also use it in a positive way when describing despair. The last stanza is very powerful. - 'the unknown road' Great work!
If nothing lasts forever, then our only option is to live forever and a day, at least that is my way.