Forget not either that it is largely a question of matter and vibration. The abstract levels of the mental plane consist of the three higher levels, the first being that termed the third subplane. As I have explained to you before, each subplane has its correlations on the major planes. When, therefore, you have built into your bodies, - physical, emotional and mental, - matter of the third subplane of each of those planes, then the Higher Self commences consciously and ever more continuously to function through the aligning Personality. Perhaps we might reverse the idea and state that it is only when third subplane matter of a certain percentage (which percentage is one of the secrets of Initiation) is contained in the vehicles, that the Personality as a conscious whole recognizes and obeys that Higher Self. After such a percentage is attained, it is then necessary to build in matter of the two higher subplanes on the physical and emotional planes; hence the struggle for the aspirant to purify and discipline the physical body and to subdue the emotional. Purification and subjugation describe the work to be done on the two planes. This involves the use of lower mind, and the three lower vehicles thus become aligned.