The use of metaphysical thinking as part of the philosophic system is a feature which few yogis of the ordinary type are likely to appreciate. This is both understandable and pardonable. They are thoroughly imbued with the futility of a merely rational and intellectual approach to reality, a futility which has also been felt and expressed in these pages. So far there is agreement with them. But when they proceed to deduce that the only way left is to crush reason and stop the working of intellect altogether, our paths diverge. For what metaphysics admittedly cannot accomplish by itself may be accomplished by a combination of metaphysics and mysticism far better than by mysticism alone. The metaphysics of truth, which is here meant, however, must never be confused with the many historical speculative systems which exist.
-- Notebooks Category 20: What Is Philosophy? > Chapter 4: Its Realization Beyond Ecstasy > # 64
-- Perspectives > Chapter 20: What Is Philosophy? > # 46