XVIII. Spiritual Science and the Spiritual Goals of Our Time
It is this attention that must be developed to infinity by the spiritual researcher in what is called concentration of thought. To do this, however, an ordinary, everyday soul force must be driven with tremendous inner energy and resignation to an extent that it is otherwise never driven in external life. The human being must bring himself to explore the state of mind in which he is when he is attentive; he must become aware of it when he is attentive in ordinary life. His attention is aroused by external impressions, by sensational things that have a strong effect on him. But the spiritual researcher must transform his attention so that he does not allow himself to be forced by anything external, but is able, through inner arbitrariness alone, to unfold the activity of the soul that would otherwise only be unfolded in attention.