This compilation of Sri Aurobindo's letters deals primarily with the role of the Divine Mother in the practice of the Integral Yoga. In these letters Sri Aurobindo explains who the Mother is and how one can open oneself to her help. Surrender to the Mother; true relation with her through faith, devotion and love; work for her as part of one's sadhana; receiving her help in difficulties; her Presence, Light and Force; her human embodiment – these are some of the subjects Sri Aurobindo discusses in these letters. He wrote most of them in the 1930s to disciples living in his Ashram in Pondicherry.