Shall I compare thee to a summer's day?
Thou art more lovely and more temperate:
Rough winds do shake the darling buds of May,
And summer's lease hath all too short a date:
Sometime too hot the eye of heaven shines,
And often is his gold complexion dimmed,
And every fair from fair sometime declines,
By chance, or nature's changing course, untrimmed:
But thy eternal summer shall not fade,
Nor lose possession of that fair thou ow'st,
Nor shall death brag thou wander'st in his shade,
When in eternal lines to time thou grow'st,
So long as men can breathe, or eyes can see,
So long lives this, and this gives life to thee.
Thou art more lovely and more temperate:
Rough winds do shake the darling buds of May,
And summer's lease hath all too short a date:
Sometime too hot the eye of heaven shines,
And often is his gold complexion dimmed,
And every fair from fair sometime declines,
By chance, or nature's changing course, untrimmed:
But thy eternal summer shall not fade,
Nor lose possession of that fair thou ow'st,
Nor shall death brag thou wander'st in his shade,
When in eternal lines to time thou grow'st,
So long as men can breathe, or eyes can see,
So long lives this, and this gives life to thee.

Sonnet 18 falls into the sonnet group dedicated to a young man (Sonnets 1-17 and 18-126). This young man was probably Shakespeare's first patron, Henry Wriothesley (pronounced either [raɪzli] or [raɪəθsli]), who was the Third Earl of Southampton.
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Shakespeare’s sonnets are quite unlike the other sonnet sequences of his day, notably in his almost unprecedented choice of a beautiful young man (rather than a lady) as his principal object of praise, love, and idealizing devotion and in his portrait of a dark, sensuous, and sexually promiscuous mistress (rather than the usual chaste and aloof blond beauty). Nor are the moods confined to what the Renaissance thought were those of the despairing Petrarchan lover; they include delight, pride, melancholy, shame, disgust, and fear.
Shakespeare’s sequence suggests a story, although the details are vague, and there is even doubt whether the sonnets as published are in an order established by the poet himself. Certain motifs are evident; an introductory series (1-17) celebrates the beauty of a young man and urges him to marry and beget children who will bear his image. The subsequent long sequence (18-126), passionately focused on the beloved young man, develops as a dominant motif the transience and destructive power of time, countered only by the force of love and the permanence of poetry. The remaining sonnets focus chiefly on the so-called Dark Lady as an alluring but degrading object of desire.
(Source: Norton Anthology: the Major Authors 539-540)