abstract:Oceanic feeling is a psychological term coined by Romain Rolland and popularized by Sigmund Freud in his books The Future of an Illusion (1927) and Civilization and Its Discontents (1929/1930) to criticize the psychological feeling of religion, the "oceanic" feeling of limitlessness. According to Rolland's definition of the term, this feeling is the source of all religious energy which permeates in various religious systems.