Synthesis of Yoga
The Integral Yoga of Sri Aurobindo is fully explained, in detail, in The Synthesis of Yoga, his principle work on yoga. Also in this volume he examines in depth all the traditional yogas.
This reading is of Chapter 28 Rajayoga on page 536: in Rajayoga the mind is the key although the practice of both Asana and Pranayama are included. However of primary importance a moral purification of the mentality is indicated. Without which the course of Rajayoga is likely to be full of mental, moral and physical perils … first are rules of moral self-control ie. truth-speaking, abstinence from killing, from theft, etc. (these are to be regarded as the general need of moral self-control in any case.) The object is to create a moral calm, void of the passions, in preparation for the death of egoism … that a satvic calmness for concentration comes into being, upon which a secure path towards the rest of the Yoga may be founded.