"You must behave as if return is certain, not a matter of chance", Jem said."

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Jem--Jem is all the better part of myself. I would not expect you to understand. I owe him this." "Then what am I?" Cecily asked. Will exhaled, too exasperated to check himself. "You are my weakness." "And Tessa is your heart," she said, not angrily, but thoughtfully. "Not a fool, as I told you," she added at his startled expression. I know that you love her.

— Cassandra Clare