" When we focus on thoughts about bitter past memories or imagined dreadful futures to the exclusion of everything else, we prevent the body from regaining homeostasis. In truth, we’re capable of turning on the stress response by thought alone. If we turn it on and then can’t turn it off, we’re surely headed for some type of illness or disease—be it a cold or cancer—as more and more genes get downregulated in a domino effect, until we eventually arrive at our genetic destiny. For "

― Joe Dispenza , You Are the Placebo: Making Your Mind Matter