The last CWSA volume contains autobiographical notes, letters and other writings, and includes early personal letters, public statements and letters on national and world events, as well as on his ashram and system of yoga.
Yoga means union with the Divine. In practice it implies coming in contact with and being established in higher and higher states of consciousness. It is the means to grow in spiritual and eventually the Divine Consciousness.
Savitri faces death's doorstep with love for Satyavan, despite knowing his fate. Her union and deep solitude shaped her into the Divine Mother's embodiment, empowering her to confront death and fate with yogic power.