If you get a chance, check out Greg Braden 's work -- especially The Spontaneous Healing of Belief and The Divine Matrix.  He uses science to explain how we can reprogram our brains to think positively for us.  How?  He says all it takes is spending 2 - 3 minutes a day focusing on gratitude to change your brain.  Sounds crazy, right? But the science backs him up.  When we think thoughts of gratitude, we calm down, our cortisol levels lower, endorphins are released, serotonin levels increase and we begin to change our energy.  We become more open to positivity, more receptive to happy outcomes.