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http://www.shakespeare-online.com/sonnets/73detail.html

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He's telling the reader that their love is strengthened by knowing their lover will eventually have to be left behind.

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Shakespeare compares himself to the glowing remnants of fire. His youth once enabled his fire to burn. It will be consumed by its own ashes on which it was created on.

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He tells the reader that his age is like a twilight. "Black light" takes away one more day of his life.

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He tells the reader that his age is like the time of year of late autumn or early winter.