Synthesis of Yoga I - II (The Complete Works of Sri Aurobindo 23-24)

"Truth of philosophy is of a merely theoretical value unless it can be lived, and we have therefore tried in The Synthesis of Yoga to arrive at a synthetical view of the principles and methods of the various lines of spiritual self-discipline and the way in which they can lead to an integral divine life in the human existence". Index. YOGA-SIDDHI, the perfection that comes from the practice of Yoga, can be best attained by the combined working of four great instruments.