In considering karma and disease, both of the individual and whole populations, we have seen that what has been prepared during earlier times spiritually asserts itself later in physical life. Therefore, if we ensure that humanity has good education and habits, we will promote health too! Not only is the moral element promoted by good habits, but also health, since bad habits create disease in the next incarnation. Nervousness, one of the most typical illnesses today, results from a particular state of mind in an earlier life. It would never have occurred if the materialistic worldview with its habits of thought had not become so prevalent. Should this mindset persist, it would devastate public health and drive humankind to madness.
Source (German): Rudolf Steiner – GA 97 – Das christliche Mysterium – Stuttgart, March 14, 1906 (page 255)
Translated by Nesta Carsten-Krüger