Man needs the life of sleep in order that the moral impulses he absorbs through the life of thought can come into effective activity. In his ordinary life today, man is capable of accomplishing what is right only on the plane of intellect; he is less able to accomplish anything on the moral plane, for there he is dependent upon help coming from the macrocosm.
What is already within us can bring about the further development of intellectuality, but the gods must come to our aid if we are to acquire greater moral strength. We sink into sleep in order that we may plunge into the divine will where the intellect does not intervene and where divine forces transform into the power of will the moral principles we receive, where they instill into our will what we could otherwise receive only into our thoughts.
Source: Rudolf Steiner – GA 130 – The Etherisation of the Blood – Basle, October 1, 1911
Translated by Gilbert Church & Alice Wulsin