"Raja Yoga, which Patanjali primarily deals with, includes the effects of all the others. It is only possible when the others have been worked with, but not in the sense of working with them in this life. Evolution has brought all the sons of men (who are ready to be chelas or disciples), through the various races, and whilst in the Lemurian race (or else on the preceding chain or greater cycle) they were all hatha and laya yogins. This resulted in the development and control of the dual physical body, dense and etheric."