Authors:

If there was one thing she was learning from all this, it was how easy it was to lose everything you had always thought you'd have forever.

Cassandra Clare (2012). “Cassandra Clare: The Mortal Instruments Series (5 books): City of Bones; City of Ashes; City of Glass; City of Fallen Angels, City of Lost Souls”, p.157, Simon and Schuster
If there was one thing she was learning from all this, it was how easy it was to lose everything you had always thought you'd have forever.