core idea of the work is that religious belief can be explained through its function in society, not through its relation to the truth. In the first part of Civilization and Its Discontents (1930), he considers the "oceanic feeling" of wholeness, limitlessness, and eternity (brought to his attention by his friend Romain Rolland), as a possible source for religious feelings. He notes that he has no experience of this feeling himself, and suggests that it is a regression into the state of consciousness that precedes the ego's differentiation of itself from the world of objects and others. Moses and Monotheism (1937) proposes that Moses was the tribal pater familias, killed by the Jews, who psychologically coped with the patricide with a reaction formation conducive to their establishing monotheistic Judaism; analogously, he described the Roman Catholic rite of Holy Communion as cultural evidence of the killing and devouring of the sacred father. Moreover, he perceived religion, with its suppression of violence, as mediator of the societal and personal, the public and the private, conflicts between Eros and Thanatos, the forces of life and death. Later works indicate Freud's pessimism about the future of civilization, which he noted in the 1931 edition of Civilization and its Discontents. Humphrey Skelton described Freud's worldview as one of "stoical humanism". The Humanist Heritage project summed his contributions to understanding of religion by saying: In a footnote of his 1909 work, Analysis of a Phobia in a Five-year-old Boy, Freud theorized that the universal fear of castration was provoked in the uncircumcised when they perceived circumcision and that this was "the deepest unconscious root of antisemitism". Legacy Freud's legacy, though a highly contested area of controversy, has been assessed as "one of the strongest influences on twentieth-century thought, its impact comparable only to that of Darwinism and Marxism," with its range of influence permeating "all the fields of culture ... so far as to change our way of life and concept of man." Psychotherapy Though not the first methodology in the practice of individual verbal psychotherapy, Freud's psychoanalytic system came to dominate the field from early in the twentieth century, forming the basis for many later variants. While these systems have adopted different theories and techniques, all have followed Freud by attempting to achieve psychic and behavioral change through having patients talk about their difficulties. Psychoanalysis is not as influential as it once was in Europe