Authors:

Weakness and corruption isn't in the world," Clary snapped. "It's in people. And it always will be. The world just needs good people to balance it out. And you're planning to kill them all.

Cassandra Clare (2010). “Cassandra Clare: The Mortal Instrument Series (3 books): City of Bones; City of Ashes; City of Glass”, p.1194, Simon and Schuster
Weakness and corruption isn't in the world, Clary snapped. It's in people. And it always will be. The world just needs good people to balance it out. And you're planning to kill them all.