In all our intercourse with the world outside, we make use of the body as an instrument, and according as we use it skillfully and well, or badly and clumsily, we occasion, at any rate in part, the events that befall us. And then, in the further lives that follow, come new compensation and balancing-out. Thus in the spiritual world we find the formative forces that belong to our moral life. The moral world becomes for us a reality.
We see how an ethical impulse cannot in one earth-life effect a change in the physical body, but when it passes over into the next life on earth, can work there quite definitely as a health-giving influence, no less truly than heat works in the physical world, or light, or electricity.
Source: Rudolf Steiner – GA 231 – Spiritual Knowledge: A Way of Life – The Hague, November 16th, 1923
Translated by Mary Adams