"Your suffering will be legendary, even in hell."
"Oh, no tears please, for it's a waste of good suffering."
And of course he says "We have such sights to show you" and "Well tear your soul apart."
Some other good ones are
"Pain has a face; allow me to show it to you. I Am Pain."
"Demons to some, Angels to others."
After the preist in part 3 says, Burn in Hell, Pinhead says "Ah, such a limited imagination."
"Down the dark decades of your pain, this will seem like a memory of Heaven."
And finally, "Just come here and die child, while you still have the option of doing it quickly. "