I saw Jonathan after he faced the fear demon, you know. It showed itself to him as you. That told me all I needed to know. The greatest fear in Jonathan's life is the love he feels for his sister.

Cassandra Clare: The Mortal Instrument Series (3 books): City of Bones; City of Ashes; City of Glass (ed. Simon and Schuster, 2010) - ISBN: 9781442430044