We are taught what to believe in but not the effects of the belief. If I awake and say today's gonna suck then guess what, my day will suck because I believed it. If I believe I can be mentally ill then my belief will lead me to mental illness. If I choose not to believe in mental illness and have the courage to choose a different perspective the concept of being mentally ill will organically vanish from my state of consciousness. We control the outcome of our day to day lives through perspective.