Quaternary — the fourfold lower self, or man, in the three worlds. There are various divisions of this, but perhaps for our purpose the best is to enumerate the four as follows:
1. Lower mind.
2. Emotional or karmic body.
3. Prana, or the Life Principle.
4. The etheric body, or the highest division of the twofold physical body.
(Alice A. Bailey "Initiation, Human and Solar")