sorrow - little essays towards truth by aleister crowley
the basic assumptions of his ontolgy conveniently are at the top …
Man is a microcosm: that is, an image (concentrated around the point of consciousness) of the macrocosm, or Universe. This Theorem is guaranteed by the hylo-idealistic demonstration that the perceptible Universe is an extension, or phantasm, of the nervous system.
It follows that all phenomena, internal and external, may be classified for the purpose of discussing their observed relations, in any manner which experience may show to be the most convenient. (Examples: the elaborate classifications of science, chemical, physical, etc., etc. There is no essential truth in any of these aids to thinking: convenience is the sole measure.) Now for the purposes of analysing the spiritual nature of man, of recording and measuring his experiences in this kind, of planning his progress to loftier heights of attainment, several systems have been devised. That of the Abhidhamma is on the surface alike the most practical, the most scientific, and the most real; but for European students it is certainly far too unwieldly, to say nothing of other lines of criticism.
Therefore, despite the danger of vagueness involved in the use of a system whose terms are largely symbolic, I have, for many reasons, preferred to present to the world as an international basis for classification, the classico-mathematical system which is vulgarly and erroneously (though conveniently) called the Qabalah.