Your body is beautifully equipped with natural self-repair mechanisms that are under the influence of thoughts, feelings and beliefs that originate in your mind. It knows how to kill cancer cells, fix broken proteins, slow aging, eliminate toxins, fight infections, get rid of foreign bodies, and otherwise keep you healthy. Things go awry and disease manifests when these self-repair mechanisms fail to function properly.
There's an interesting saying, "If you want to know where your heart is, look where your mind goes when it wanders." Does it wander to thoughts and emotions of fear, worry and confusion? Or does your wandering thoughts lead you to feelings of excitement and enthusiasm? Either emotion you choose notice how they're all based on expectations of future events. Whether you're sending signals of positive expectations or negative depends entirely on the actions you have taken in the past and at the present moment.