In November 1927, Freud's new book
The Future of an Illusion was printed, and one of the copies was sent by him to
Rolland. Rolland responded with a
letter to Freud, writing that he should also consider spiritual experiences, or "the oceanic feeling", in his future psychological works: Rolland based his description on the example of Ramakrishna who had his first spiritual ecstasy at the age of six. From his 10th or 11th year of school on, the
trances became common, and by the final years of his life,
Ramakrishna's samādhi periods occurred almost daily. Rolland described the trances and
mystical states experienced by
Ramakrishna and other mystics as an oceanic' sentiment", one which Rolland had also experienced. As described by Rolland, it is "a sensation of 'eternity', a feeling as of something limitless, unbounded", a "feeling of an indissoluble bond, of being one with the external world as a whole". In his 1929 book
The Life of Ramakrishna, Rolland distinguished between the feelings of unity and eternity which Ramakrishna experienced in his mystical states, and Ramakrishna's interpretation of those feelings as visions of the goddess
Kali figure. In July 1929, Freud asked for permission to publish in his next book an answer to Rolland's previous request about oceanic feelings. In the beginning his new book
Civilization and Its Discontents (1929) Freud attributed the concept to an anonymous friend, but in a later edition a footnote was added revealing Rolland's name. == Freud's explanation ==