Please explain the last two lines of Sonnet 18 by William Shakespeare.

The last two lines of Sonnet 18 by William Shakespeare assert that this sonnet has made its subject immortal, since even after the subject dies, the sonnet will always be read.

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In the last two lines of Shakespeare's Sonnet 18, the speaker argues that his beloved will be immortalized by the poem, that they will live on in the minds of men long after they have died.

This explains why it is inappropriate to compare the speaker's beloved to a summer's day or all the other features of the natural world referred to elsewhere in the poem. A summer's day, no matter how beautiful, will eventually fade away. And summer itself, no matter how hot and sunny, will always pass on to autumn.

But the beloved's “eternal summer,” their inner beauty as a human being, will never fade away, will never die. That is because the speaker has immortalized them in verse, in “eternal lines” that will live on so long as they are read and enjoyed by successive generations of poetry lovers.

In effect, this constitutes a great victory of art over life: Ars longa, vita brevis; art is long, life is short. In other words, art, like Sonnet 18, transcends the time and place in which it was written to speak to successive generations. Therein lies its universality, what makes it truly special and enduring. The same cannot be said for a summer's day, no matter how beautiful.

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The last two lines of Sonnet 18 are as follows:

So long as men can breathe or eyes can see,
So long lives this, and this gives life to thee.
In these lines, Shakespeare's speaker is addressing his beloved: "thee" or you. He says that for as long as people—by which he means civilization—survive, so will this sonnet. He then states that these verses will keep his beloved immortal. He does not mean physically immortal but immortal or alive in memory, for anyone who reads the poem will be remembering his beloved.
The sonnet as a whole compares the transitory and uncertain nature of a summer's day—a summer's day can be cold or cloudy, for instance—to the unchanging nature and beauties of the beloved's soul. This sonnet pokes fun at the common cliche of an adoring poet comparing a woman to a summer day, always a day idealized to be unrealistically perfect. Shakespeare points out that summer is far less perfect than we like to believe.
The final couplet, however, points to the contrast between nature and art. Not only is a summer's day uncertain—possibly rainy or windy—it is also transitory. Summer passes, because the seasons are part of the cycle of life and death. Words, a form of art when rendered into a poem, are not transitory but stay fixed and timeless.
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A Shakespearean sonnet usually ends with a "turn" in the final couplet. This means that the subject of the first twelve lines is considered from a different perspective, or that the poet adds a new idea to the argument he has been making. In Sonnet 18, the poet has been comparing his beloved with a summer's day, to the advantage of the beloved. None of the factors which might spoil the summer's day are present in the addressee, who outshines it in every way.

The final point Shakespeare makes is that unlike the summer's day, the subject of his sonnet is immortal. This is a larger claim than the reader expects. It is true that young lovers last longer than summer's days, but they do not last forever. The poet, therefore, explains in the last two lines,

So long as men can breathe or eyes can see,
So long lives this, and this gives life to thee.
This is an unusually decisive turn. The subject changes from the beloved to the poem itself. As long as there are seeing, breathing men in the world, they will read this poem, and this poem gives life to the addressee.
This change of focus is given an added point by the fact that the reader has just proved the first assertion correct (or at least reasonable) by reading the poem. It is, however, highly debatable whether the poem has given life to the beloved, since the reader learns nothing about them. Even the idea that the addressee is a young man rather than a woman is supplied by context from the other sonnets and is not discernible from this poem alone. The final couplet, therefore, not only changes the perspective of the reader to focus on the poem itself, but reveals how the poem and the poet's art have been the central themes throughout.
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What the last two lines of this sonnet mean is that Shakespeare is bragging about the importance of his work and of this poem in particular.

In the rest of the poem, he has talked about (among other things) how brief and transient a summer's day is.  Then he has contrasted that with how his love will be immortal.  He has said that she will never die because he has written this poem about her (that is what the line just before the couplet is saying).

In the couplet, he completes the thought by saying that as long as people exist, this poem will exist and she will live in the poem.

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