It is not enough to negate thinking; this may yield a mental blank without content. We have also to transcend it. The first is the way of ordinary yoga; the second is the way of philosophic yoga. In the second way, therefore, we seek strenuously to carry thought to its most abstract and rarefied point, to a critical culminating whereby its whole character changes and it merges of its own accord in the higher source whence it arises. If successful, this produces a pleasant, sometimes ecstatic state--but the ecstasy is not our aim, as with ordinary mysticism. With us the reflection must keep loyally to a loftier aim, that of dissolving the ego in its divine source. The metaphysical thinking must work its way, first upwards to a more and more abstract concept and second inwards to a more and more complete absorption from the external world. The consequence is that when illumination results, whether it comes in the form of a mystical trance, ecstasy, or intuition, its character will be unquestionably different and immeasurably superior to that which comes from the mere sterilization of the thinking process which is the method of ordinary yoga.
-- Notebooks Category 20: What Is Philosophy? > Chapter 4 : Its Realization Beyond Ecstasy > # 62
-- Perspectives > Chapter 20: What Is Philosophy? > # 42
