My true-love hath my heart and I have his,
By just exchange one for the other given:
I hold his dear, and mine he cannot miss;
There never was a bargain better driven.
His heart in me keeps me and him in one;
My heart in him his thoughts and senses guides:
He loves my heart, for once it was his own;
I cherish his because in me it bides.
His heart his wound received from my sight;
My heart was wounded with his wounded heart;
For as from me on him his hurt did light,
So still, methought, in me his hurt did smart:
Both equal hurt, in this change sought our bliss,
My true love hath my heart and I have his.

Sir Philip Sidney

http://www.poemhunter.com/poem/my-true-love-hath-my-heart/