When the child has outgrown the stage of authority, when he has attained puberty and through this has physiologically quite a different connection with the outer world than before, he also attains in soul and body (in his bodily life in its most comprehensive sense) a quite different relation-ship to the world than he had earlier. This is the time of the awakening of Spirit in Man. This now is the time when the human being seeks out the rational and logical aspect in all verbal expression. Only now can we hope to appeal with any success to the intellect in our education and instruction. It is immensely important that we do not consciously or unconsciously call upon the intellect prematurely, as people are so prone to do to-day.
Source: Rudolf Steiner – GA 305 – Spiritual Ground: Lecture I: The Necessity for a Spiritual Insight – Oxford, August 16, 1922