the precision of pain

The precision of pain and the blurriness of joy. I'm thinking 
how precise people are when they describe their pain in a doctor's office.
Even those who haven't learned to read and write are precise:
"This one's a throbbing pain, that one's a wrenching pain,
this one gnaws, that one burns, this is a sharp pain
and that––a dull one. Right here. Precisely here,
yes, yes." Joy blurs everything. I've heard people say
after nights of love and feasting, "It was great,
I was in seventh heaven." Even the spaceman who floated
in outer space, tethered to a spaceship, could say only, "Great,
wonderful, I have no words."
The blurriness of joy and the precision of pain — 
I want to describe, with a sharp pain's precision, happiness
and blurry joy. I learned to speak among the pains.