Of Shakespeare, of course:

Sonnet 104

To me, fair friend, you never can be old,
For as you were when first your eye I eyed,
Such seems your beauty still now. Three winters cold
Have from the forests shook three summers’ pride,
Three beauteous springs to yellow autumn turn’d
In process of the seasons have I seen,
Three April perfumes in three hot Junes burn’d,
Since first I saw you fresh, which yet are green.
Ah! yet doth beauty, like a dial-hand,
Steal from his figure and no pace perceived;
So your sweet hue, which methinks still doth stand,
Hath motion and mine eye may be deceived:
For fear of which, hear this, thou age unbred;
Ere you were born was beauty’s summer dead.

Sonnet 119

What potions have I drunk of Siren tears
Distilled from limbecks foul as hell within,
Applying fears to hopes, and hopes to fears,
Still losing when I saw my self to win!
What wretched errors hath my heart committed,
Whilst it hath thought it self so blessed never!
How have mine eyes out of their spheres been fitted
In the distraction of this madding fever!
O benefit of ill, now I find true
That better is, by evil still made better.
And ruined love when that it grows anew
Shows fairer than at first, more strong, far greater.
So I return rebuked to my content,
And gain by ills thrice more than I have spent.

AMDG