Software is fallible. Our applications are made of software, so they're vulnerable to failures. We add monitoring to tell us when the applications fail, but that monitoring is made of software so it too is fallible.

Michael Nygard

in "97 Things Every Software Architect Should Know," edited by Richard Monson-Haefel, O'REILLY, www.oreilly.com, 2009, ISBN 978-0-596-52269-8