Authors:

One thing you'll learn as you get older, Simon, is that when people tell you something unpleasant about themselves, it's usually true.

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.1001, Simon and Schuster
One thing you'll learn as you get older, Simon, is that when people tell you something unpleasant about themselves, it's usually true.