These days human beings speak of the soul and the spirit, for sure; they speak of the body and its physical qualities. And then great philosophies on the relationship between soul and body are engendered. There exist comprehensive theories by the cleverest people. The theories are ingenious, very perceptive, but they cannot grasp reality, for the simple reason that the only way to grasp reality is when the whole human being, the all-inclusive human being, can be seen in direct perception, when the interweaving activity of both the spiritual-psychic and corporal-physical is considered. And the person who truly contemplates contemporary perceptions grasped by humanity, will likewise discover how grey and hazy both outer and inner human knowledge is.
Source (German): Rudolf Steiner – GA 303 – Die gesunde Entwickelung des Menschenwesens – Eine Einführung in die anthroposophische Pädagogik und Didaktik – Dornach, 28 December 1921 (page 102-103)
Translated by Nesta Carsten-Krüger