Of a future uncertain 'til the fall of the curtain

from Blue Scholars – No Rest For The Weary Lyrics on Rap Genius

Meaning

never know where life will take you until it’s done, or “the show is over”.

This line could also be a reference to the Iron Curtain, that divided Europe after World War II. The fall of the Iron Curtain involved the fall of communism and a new era for the world.

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