The sections "Thoughts on Samkhya", "Rambling Thoughts", etc. to be found in Reymond's "To Live Within" were given a separate book-form in 1983 and published by the Sri Aurobindo Pathmandir, Calcutta as "Letters from a Baul: Life Within Life". In the preface to this volume, Mdm. Reymond says that before he passed away, Anirvanji (that is the usual Bengali mode of addressing Sri Anirvan) carefullly made additions and alterations to the text to express his thoughts better. Another piece which may appear very useful for understanding Anirvanji's thought is his introduction to Reymond's book "Shakti: A Spiritual Experience". There he nicely deals with the concept of Void (Akasa) dealt with in the Upanisads.