Satprem remained restless and dissatisfied for some years, torn between his devotion to the Mother and to Sri Aurobindo’s teachings and his wanderlust, and in 1959 he again left the ashram. He became the disciple of a Tantric, a priest of temple at Rameswaram. Then as the disciple of another Yogi he spent six months and wandering around India as a mendicant sanyasi practicing Tantra, which formed the basis of his second novel, Par le Corps de la Terre, ou le Sanyassin (By the Body of the Earth, or The Sanyasi).

After this he returned again (as he put it, “the bird flew back once more”), to the Pondicherry Ashram and the Mother, who started inviting him from time to time to her room, originally for work in connection with the Bulletin. As their relationship developed, he asked more questions, and eventually decided to record their conversations, taking a tape-recorder to her room. The result of this collaboration was The Agenda, the first volume of which (which covers 1951 to 1960) also contains Satprem’s letters to The Mother during his wandering days. Also, under The Mother’s guidance he wrote Sri Aurobindo, ou l’Aventure de la Conscience (Sri Aurobindo, or the Adventure of Consciousness), which became the most popular introductory book to Sri Aurobindo and The Mother (published 1964). In 1972 and 1973 he also wrote under the Mother’s guidance the essay La Genèse du Surhomme (On the Way to Supermanhood), which she regarded very highly. This was published in 1974.

Satprem relates that on 19 May 1973, six months before The Mother’s death he was barred admission to her room, the beginning of a serious falling out between the Ashram leadership and himself. Moreover, Satprem and his followers believe there is evidence in the recorded audiotapes that the Mother did not actually die but rather entered a “cataleptic trance” or state of suspended animation in which there would not even be a detectable heartbeat. Satprem recorded a famous conversation between the Mother and Pranab which made Satprem conclude that several Ashram sadhaks did not want the Mother to continue her life. However, Pranab has argued that on the contrary he was very much concerned about the Mother’s health and that he had received precise instructions from her as to what to do when she appeared to have left her body. These instructions, he says, were exactly followed before she was buried in the second chamber of Sri Aurobindo’s Samadhi in the Ashram courtyard under the Service tree, which she herself got prepared after Sri Aurobindo’s departure in Dec. 1950.

Georges Van Vrekhem disagrees with Satprem’s claim that the Mother’s work was cut short in those last six months, and argues instead that she did indeed attain a Supramental body and what remained was the residue, like the empty cocoon of a caterpillar after it has become a butterfly.

After the Mother’s death, all of Satprem’s correspondence from 1962 to 1973 with the Mother was confiscated, and he fled with the tapes of the Agenda to Auroville, where, at the age of fifty, he edited the 13 volumes of the Agenda, while at the same time wrote the trilogy Mère (Mother) – Le Matérialisme Divin (The Divine Materialism), L’Espèce Nouvelle (The New Species), La Mutation de la Mort (The Mutation of Death) – both a biography of the Mother and his own analyses and commentary on the Agenda material.

Satprem became a rallying point for the community shocked by the attitude the ashram leaders had taken. His one-man revolt against the Ashram leadership began in 1974, and involved two issues. One was his wish to publish, unexpurgated, the entire transcript of his talks with the Mother. He saw the resistance of the ashram trustees and elders in this regard as symptomatic of the way they had directed the ashram from 1962 onwards. The other was his claim that under the current leadership the Yoga had become institutionalised and dogmatic, like the yogas of the past. For their part, the elders wished to publish the transcripts but only in edited form. And where Satprem saw conservatism and dogmatism, they saw a loyal commitment to their gurus to uphold the original truth of their teachings.

During this time, Satprem was looked to by the French-speaking Aurovillians as the successor and inheritor of Sri Aurobindo and the Mother’s work, and a number of radicals were drawn to him because of his revolt against the Ashram elders.

After numerous unsuccessful attempts to get the 13 volumes of the Agenda published by the Ashram, Auroville, and Sri Aurobindo Society presses, Satprem founded the Institut de Recherches Évolutives (Institute for Evolutionary Research) in Paris in July 1977 as a non-profit organisation to do so.”

Soon after, there was an allegation of an assassination attempt against him in August 1976, and in December 1977 (or 1978) the Ashram trustees “expelled” him for “anti-ashram activities” as he attempted to publish the Agenda, and he became persona non grata in the Ashram. Satprem and Sujata left Pondicherry in 1978.

In 1980 Satprem wrote Le Mental des Cellules (The Mind of the Cells), a synopsis and introduction of the whole Agenda, with many fascinating and important excerpts, and written with great passion, even if his frequent Darwinian metaphors hardly bear resemblance to the actual scientific theory of Darwinism. He also refers to personal experiences, including the 1976 attempt upon his life, which he only survived by going into a state of complete non-resistance.

In 1982 all thirteen volumes of the Agenda were published in French, and Satprem felt he had completed all his external work. The following year, he and Sujata decided to withdraw completely from public life to devote themselves exclusively to Sri Aurobindo’s and Mother’s work of the transformation of the cellular consciousness of the body and realisation of the new evolution, and the search for the “great passage” in the evolution beyond Man. The 1985 book La Vie sans Mort (Life without Death) is a follow-up to Mind of the Cells, co-written with Luc Venet, and provides a glimpse of Satprem in his post-Ashram life in this period.

After seven years, Satprem emerged and began producing a steady stream of books on his experiences, Sri Aurobindo and the Mother’s teachings, and the future evolution of Man. In 1989, he wrote La Révolte de la Terre (The Revolt of the Earth), in which he describes his years “digging” in the body. This was followed in 1992 by Evolution II, where he asks “After Man, who? But the question is: After Man, how?” In 1994 came his Lettres d’un Insoumis (Letters of a Rebel), two volumes of autobiographical correspondence. In 1995 he wrote La Tragédie de la Terre – de Sophocle à Sri Aurobindo (The Tragedy of the Earth – from Sophocles to Sri Aurobindo), an urgent message for mankind to take action against the cycle of death. This was followed in 1998 by La Clef des Contes (The Key of Tales), and in 1999 by ‘Néanderthal Regarde (Neanderthal Looks On), an essay on the betrayal of Man in India as in the West. In 2000 followed La Légende de l’Avenir (The Legend of the Future) and in 2002 Mémoires d’un Patagonien – Conte Préhistorique et Posthistorique (Memoires of a Patagonian – Prehistoric and Posthistoric Tale) and La Philosophie de l’Amour (The Philosophy of Love). In 2008, the IRE published his last book, L’Oiseau Doël (The Doël Bird).
In 1999, Satprem also started the publication of his Carnets d’un Apocalypse (Notebooks of an Apocalypse) (in French, seven volumes published to date, in English only vol.1, 1973-1978, dealing with the years and his experiences immediately after the passing of the Mother), which records his work in the depths of the body consciousness.

Satprem died on April 9, 2007 at the age of 83.

His companion Sujata Nahar died after him on May 4, 2007.