We do not, as a rule, find that the pursuit of purely intellectual knowledge has any specific effect on character; but when a man has probed to the heart of spiritual knowledge, he knows that he cannot apprehend such knowledge without its affecting his character, without its entering — to speak in a paradox — into the flesh and blood of his soul, developing in him an inclination to selflessness, to love.
Source: Rudolf Steiner – GA 231 – Spiritual Knowledge: A Way of Life – The Hague, November 16th, 1923
Translated by Mary Adams