Authors:

You didn't kill him. He would have killed you, but you didn't kill him." "So? He was stupid. If I killed everyone who was stupid, I wouldn't have time to sleep.

Tamora Pierce (2009). “In the Hand of the Goddess”, p.28, Simon and Schuster
You didn't kill him. He would have killed you, but you didn't kill him. So? He was stupid. If I killed everyone who was stupid, I wouldn't have time to sleep.