Whereas the ordinary yogas seek primarily to control the activities of consciousness, the higher yoga seeks in addition to bring enlightenment to its practiser both about the objects of his consciousness and about the consciousness itself. Consequently it is different from them in inward spirit as well as outward form. Thus the earlier yogas serve really as starting points whence we travel to the ultimate one. They are not ends in themselves but only means to help us reach an end. The error of most Westerners and many Orientals is to regard the various yoga paths as approaches of equal value rather than as stages of increasing importance. All other yogas prepare the aspirant to be fit to follow this philosophic and higher yoga. They do not and cannot take him to the ultimate realization. Nevertheless, although they cannot bring the full insight to birth, they are necessary prerequisites for this birth.
-- Notebooks Category 16: The Sensitives > Chapter 2: Phases of Mystical Development > # 226