Cassandra Clare said this quote

Truth is to be found in dreams,” the King said, looking down at them. From this angle, Emma could see that odd splitting of his face ended at his throat, which was ordinary skin. “Tell me, Shadowhunters: you enter a cave. Inside the cave is and egg, lit from within and glowing. You know that it beats with you dreams-not the ones you have during the day, but the ones you half-remember in the morning. It splits open.What emerges?” “A rose,” said Mark. “With thorns.” Cristina cut her eyes toward him in surprise but remained motionless. “An angel,” she said. “With bloody hands.” “A knife,” said Emma. “Pure and clean.” “Bars,” Julian said quietly. “The bars of a prison cell.