John Wilmot - Constancy

I cannot change, as others do,
Though you unjustly scorn;
Since that poor swain, that sighs for you
For you alone was born.
No, Phyllis, no, your heart to move
A surer way I'll try:
And to revenge my slighted love,
Will still love on, will still love on, and die.

When, kill'd with grief, Amyntas lies;
And you to mind shall call
The sighs that now unpitied rise;
The tears that vainly fall:
That welcome hour that ends this smart,
Will then begin your pain;
For such a faithful, tender heart
Can never break, can never break in vain.

John Wilmot

http://www.poemhunter.com/poem/constancy/