To........ - Thomas Moore

Thomas Moore (1779 - 1852) - Irish-born and popularizer of Irish melodies, he lived in London most of his adult life.  (He wrote the lyrics for "The Last Rose of Summer".)  As a poet, composer, and satirist, he was a man of many talents and widely-known for being an ardent  Irish nationalist, though later accused of not doing enough and being false to the cause.  In his personal life, five of his children died before him.  He was also severely criticized for burning Byron's autobiography at the behest of Byron's sister and others, who feared its candor.  The language in this one is striking for sounding like it could have been written last week.
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To……

When I loved you, I can’t but allow
  I had many an exquisite minute;
But the scorn that I feel for you now
  Hath even more luxury in it!

Thus, whether we’re on or we’re off,
  Some witchery seems to await you;
To love you is pleasant enough,
  But oh! ‘tis delicious to hate you!

                                                                                       Thomas Moore- Irish