Quote from : City of Glass Book

Now very much against her will, she thought of the way Jace had looked at her then, the blaze of faith in his eyes, his belief in her. He had always thought she was strong. He had showed it in everything he did, in every look and every touch. Simon had faith in her too, yet when he'd held her, it had been as if she were something fragile, something made of delicate glass. But Jace had held her with all the strength he had, never wondering if she could take it--he'd known she was as strong has he was.