Love Sonnet LVI

Sweet love, renew thy force; be it not said
Thy edge should blunter be than appetite,
Which but to-day by feeding is allay'd,
To-morrow sharpened in his former might:
So, love, be thou, although to-day thou fill
Thy hungry eyes, even till they wink with fulness,
To-morrow see again, and do not kill
The spirit of love, with a perpetual dulness.
Let this sad interim like the ocean be
Which parts the shore, where two contracted new
Come daily to the banks, that when they see
Return of love, more blest may be the view;
    Or call it winter, which being full of care,
    Makes summer's welcome, thrice more wished, more rare.

(Shakespeare, William. Sonnet 56)

Love Sonnet II

When forty winters shall besiege thy brow,
And dig deep trenches in thy beauty's field,
Thy youth's proud livery so gazed on now,
Will be a totter'd weed of small worth held:
Then being asked, where all thy beauty lies,
Where all the treasure of thy lusty days;
To say, within thine own deep sunken eyes,
Were an all-eating shame, and thriftless praise.
How much more praise deserv'd thy beauty's use,
If thou couldst answer 'This fair child of mine
Shall sum my count, and make my old excuse,'
Proving his beauty by succession thine!
    This were to be new made when thou art old,
    And see thy blood warm when thou feel'st it cold.

(Shakespeare, William. Sonnet 2)