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When the meditation deepens sufficiently, he may feel that higher forces seize hold of him, of his will and mind, body and self, even of his breathing. But to predict with certainty when this may happen is usually beyond his capacity. A long-established experience and a high degree of concentration would be the first prerequisites for this, and there are others too.
-- Notebooks Category 4: Elementary Meditation > Chapter 1 : Preparatory > # 273