I was sent this link by Dr Cobb of Z-Health. It is a short article explaining how we can use passwords to help us achieve our goals, whatever they are. I thought it so powerful and simple that it has to be worth a punt.
http://www.today.com/health/how-password-changed-one-mans-life-better-1D79878606
Also of interest may be the following youtube clip about the power of words.