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SONNET 22

My glass shall not persuade me I am old,
So long as youth and thou are of one date;
But when in thee time's furrows I behold,
Then look I death my days should expiate.
For all that beauty that doth cover thee 5
Is but the seemly raiment of my heart,
Which in thy breast doth live, as thine in me:
How can I then be elder than thou art?
O, therefore, love, be of thyself so wary
As I, not for myself, but for thee will; 10
Bearing thy heart, which I will keep so chary
As tender nurse her babe from faring ill.
    Presume not on thy heart when mine is slain;
    Thou gavest me thine, not to give back again. 14