One i learnt on the Psych-K course was a simple self-fulfilling prophecy circle. Beliefs drive Behaviour--Behaviour affects Experience--Experience reinforces Beliefs. The important part is the last bit, you have to complete the circle to lock in a positive change by performing some kind of action; living your new belief system as it were. The more you live a positive belief system the more it will reinforce itself. People like me and Trev have a habit of automatically letting the old belief systems self-reinforce without realising!