Letters on yoga (book 1)

"Letters on yoga" have a special place in the legacy of Sri Aurobindo, an Indian politician, philosopher, and yogi. Most of these letters refers to the later period of his yoga. That is why they present the resulting system descriptions of spiritual experience, through which Sri Aurobindo was able to lead the internal development of their students through correspondence.
This volume contains the following sections: "the Evolution of the supramental consciousness", "Integral yoga and other paths," "Religion, morality, idealism and yoga", "Yoga, philosophy and science".