Give a commentary on the poem "Sonnet 18" by William Shakespeare.
Sonnet 18 is one of Shakespeare's best-known poems. It employs an extended metaphor throughout, as described in the first line—he compares his beloved to a summer's day. In every respect, the lover comes off best.
The first quatrain praises the lover as "more lovely" and "more temperate," then introduces the idea that the summer can be troubled by bad weather and is far too short: "summer's lease hath all too short a date."
In the second quatrain, Shakespeare continues to describe how summer is imperfect: the sun can be too hot or be covered by clouds. He then brings in the broader idea that all beautiful things will ultimately decay: "and every fair from fair sometimes declines," whether through "chance" or through nature's inherent progression towards death.
The third quatrain, though, introduces the idea of his beloved being immortal: "but thy eternal summer shall not fade." His lover won't become any less beautiful over time, nor will death be able to "brag" that he has defeated him,...
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