Using the Ferenczi–Freud relationship, which culminated in Ferenczi's decision to read his Confusion of Tongues (1933) paper to Freud as a clinical example, the conflict between the need to belong expressed through sharing ideas and the need for individuation by being faithful to one’s own beliefs is explored. The need for the group to enforce conformity of thought, the vehemence of the response to deviant ideas, the need for and costs of membership, as well as the sacrifices the individual is willing to endure for both belonging and individuation, are taken as evidence of the centrality of psychological issues involved, including love, power, submission, and separation raised by the poles of the conflict that may exceed the ultimate validity of the particular idea, its role in psychic structure at least as important as the idea itself. The various sources of vehemence, as well as the fate of deviant ideas, are discussed. The problem of dissidence in psychoanalysis is compared to the problem of dissidence in other belief systems, notably science and religion.