18: T. Subba Rao says on page 20, of Esoteric Writings:  "As a general rule, whenever seven entities are mentioned in the ancient occult science of India in any connection whatsoever, you must suppose that those seven entities came into existence from three primary entities and that these three entities again are evolved out of a single entity or monad.  To take a familiar example, the seven coloured rays in the solar ray are evolved out of three primary coloured rays; and the three primary colours co-exist with the four secondary colours in the solar ray.  Similarly the three primary entities which brought man into existence co-exist in him with the four secondary entities which arose from different combinations of the three primary entities."
In Christian terminology these are the three Persons of the Trinity, and the seven Spirits which are before the Throne.  Compare "Our God is a consuming fire."  Heb:  12.29.