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Yoga is not finished when a yogin can concentrate perfectly and keep his mind utterly quiet. Certainly he who has reached this point has mastered raja yoga--the royal union--but he must go farther and use the wonderful instrument he has now developed for the mastery of the advanced phases of gnana yoga--the union with truth. In the earlier phases he can employ a sharpened intellect, but depth of intuition and an ego-freed will to know are needed for the later ones.
-- Notebooks Category 4: Elementary Meditation > Chapter 1 : Preparatory > # 80