Weep for what thou'st lost, love-
Weep for what thou'st done-
Weep for what thou did'st not do,
And more for what thou'st done.
Time that's gone returneth never,
Keen repining lasteth ever;
Heart that's pierc'd refuseth gladness,
Melancholy causeth madness.


Yet if tears avail not,
Tears of fond regret;
Arm thy mind, and proudly girl,
Endeavour to forget.
Shouldst thou spend thy days in grieving,
What is past, there's no retrieving,
Once the hour of passion over,
Tear nor frown recalls a lover.

Lady Caroline Lamb

http://www.poemhunter.com/poem/weep-for-what-thou-st-lost/