I guess that one must start with a profound thought. That's easy. I will steal one from Terry Pratchett:

“[T]here are hardly any of the excess of the most crazed psychopath that cannot easily be duplicated by a normal, kindly family man who just comes into work every day and has a job to do. … A man who knew that, knew everything he needed to know about people.”
Small Gods (Corgi Paperback edition), p.20