Cassandra Clare said this quote

As for the temperature of Hell, Miss Gray,” he said, “let me give you a piece of advice. The handsome young fellow who’s trying to rescue you from a hideous fate is never wrong. Not even if he says the sky is purple and made of hedgehogs.”He really is mad, Tessa thought, but didn’t say so; she was too alarmed by the fact that he had started toward the wide double doors of the Dark Sisters’ chambers.“No!” She caught at his arm, pulling him back. “Not that way. There’s no way out. It’s a dead end.”“Correcting me again, I see.” Will turned and strode the other way, toward the shadowy corridor Tessa had always feared. Swallowing hard, she followed him.