Spider Robinson
American-born Canadian Hugo and Nebula award winning science fiction author.
"It took a couple of hundred million years to develop a thinking ape and you want a smart one in a lousy few hundred thousand? That lemming drive you're talking about is there — but there's another kind of drive, another kind of force that's working against it. Or else there wouldn't still be any people and there wouldn't be the words to have this conversation and—" She paused, looked down at herself. "And I wouldn't be here to say them."
"God is an iron," I said. "Did you know that?"
I turned to look at her and she was staring. She laughed experimentally, stopped when I failed to join in. "And I'm a pair of pants with a hole scorched through the ass?"
"If a person who indulges in gluttony is a glutton, and a person who commits a felony is a felon, then God is an iron."
Just as there are Laws of Conservation of Matter and Energy, so there are in fact Laws of Conservation of Pain and Joy. Neither can ever be created or destroyed.
But one can be converted into the other.