A true educational science can only arise from the supernaturally-derived knowledge of the human nature complete in its physical, psychic and spiritual being. A knowledge keeping solely within the limits of what is attainable to natural science cannot be called a foundation of a true educational science.
Source: Rudolf Steiner – GA 215 – Philosophy, Cosmology and Religion: CHAPTER X: ON EXPERIENCING THE WILL-PART OF THE SOUL – Dornach, 15th September, 1922
Translated by Harry Collison