Louise Penny said this quote
“ Murder was deeply human. A person was killed and a person killed. And what powered the final thrust wasn't a whim, wasn't an event. It was an emotion. Something once healthy and human had become wretched and bloated and finally buried. But not put to rest. It lay there, often for decades, feeding on itself, growing and gnawing, grim and full of grievance. Until it finally broke free of all human restraint. Not conscience, not fear, not social convention could contain it. When that happened, all hell broke loose. And a man became a monster. ”