"But thy eternal summer shall not fade (9)"- Explain the line.

The above line is taken ..................

In line 9 we come to realize that this whole comparison with the summer is bizarre. Check out this line: "thy eternal summer shall not fade." That’s like saying "thy unbreakable armor shall not be broken." Duh, his/her eternal summer won’t fade, because it’s eternal. Plus, there’s the added issue that the comparison.................. 

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