Scarcely as yet have men succeeded in directing the fire up more than one channel of the threefold column; hence two-thirds of its effect in the majority is yet confined to the stimulation of the organs of race propagation. Only when the fire has circled unimpeded up another channel is the complete merging with the fire of manas effected, and only when it progresses geometrically up all the three - with simultaneous action and at uniform vibration - is the true kundalini fire fully aroused, and therefore able to perform its work of cleansing through the burning of the confining web and of the separating particles. When this is accomplished the threefold channel becomes one channel. Hence the danger.
No more can be imparted concerning this subject. He who directs his efforts to the control of the fires of matter, is (with a dangerous certainty) playing with a fire that may literally destroy him. He should not cast his eyes backwards, but should lift them to the plane where dwells his immortal Spirit, and then by self-discipline, mind-control and a definite refining of his material bodies, whether subtle or physical, fit himself to be a vehicle for the divine birth, and participate in the first Initiation. When the Christ-child has been born in the cave of the heart, then that divine guest can consciously control the lower material bodies by means of consecrated mind. Only when buddhi has assumed an ever-increasing control of the personality, via the mental plane (hence the need of building the antahkarana), will the personality respond to that which is above, and the lower fires mount and blend with the two higher.
Only when Spirit, by the power of thought, controls the material vehicles, does the subjective life assume its rightful place, does the God within shine and blaze forth till the form is lost from sight, and "The path of the just shine ever more and more until the day be with us." (Alice A Bailey)