O, who can hold a fire in his hand
By thinking on the frosty Caucasus?
Or cloy the hungry edge of appetite
By bare imagination of a feast?
Or wallow naked in December snow
By thinking on fantastic summer's heat?
O, no! the apprehension of the good
Gives but the greater feeling to the worse:
Fell sorrow's tooth doth never rankle more
Than when he bites, but lanceth not the sore.