The thing we love is the thing we can't possess 
those who do not have love, know love best 
to desire, to imagine, to obsess 
our love kindles our most zealous zest 
In our bosom we love and jealous rest 
Unbosom thyself, thou reveal who thou really are 
Anything but a heavenly star 
A soul possessed by loves dark mar 
Burning for a soul from afar 
Love has no limits in thy mind 
Its magic passion turns one blind 
And in its center thyself you'll find 
That what it is that makes one bind 
The thing thy love, to thy own pain 
By thine obsession, thy so incessantly gain 
Nothing from love, but love's vain 
To thy detriment thou go insaneā¦. 
and love a thing thou wilt never possessā¦. 
to desire, to imagine, to obsess
Kevin Michael Murphy
http://www.poemhunter.com/poem/sancire/