The activity of analytic thinking has been banned in most mystical schools. They regard it as an obstacle to the attainment of spiritual consciousness. And ordinarily it is indeed so. For until the intellect can lie perfectly still, such consciousness cannot make itself apparent. The difficulty of making intellect quite passive is however an enormous one. Consequently different concentration techniques have been devised to overcome it. Nearly all of them involve the banishment of thinking and the cessation of reasoning. The philosophical school uses any or all of them where advisable but it also uses a technique peculiarly its own. It makes use of abstract concepts which are concerned with the nature of the mind itself and which are furnished by seers who have developed a deep insight into such nature. It permits the student to work out these concepts in a rational way but leading to subtler and subtler moods until they automatically vanish and thinking ceases as the transcendental state is induced to come of itself. This method is particularly suited either to those who have already got over the elementary difficulties of concentration or to those who regard reasoning power as an asset to be conserved rather than rejected. The conventional mystic, being the victim of external suggestion, will cling to the traditional view of his own school, which usually sees no good at all in reasoned thinking, and aver that spiritual attainment through such a path is psychologically impossible. Never having been instructed in it and never having tried it, he is not really in a position to judge.
-- Notebooks Category 20: What Is Philosophy? > Chapter 4: Its Realization Beyond Ecstasy > # 65
-- Perspectives > Chapter 20: What Is Philosophy? > # 43