Just read Barbara Wolf website on meditation and related stuff and got a new definition:
stress = dis-ease = disease
Wow, so when we are at stress we are automatically at dis-ease and this is what makes us ill. Because otherwise our bodies are made to be healthy and happy as ever.
This approach really makes it easy to understand how our internal and external realities are all in control of our consciousness and when we control this consciousness we actually become the creator.
You can check out her website http://www.globalmeditations.com/Menu.htm for information on this concept.