This essay presents a reading of the work of two central figures of modern social theory that locates their work within not simply mainstream Jewish thought, but a particular Hasidic tradition. Further, I argue that lying behind this, in a repressed form, is an even older tradition of Jewish alchemy. I make no claim to have evidence that either Freud or Durkheim were directly influenced by Hasidism or alchemy, but I examine the parallels between the structure of their thoughts and those of the two traditions. Both Freud and Durkheim display a social psychology that is analytically similar to the dualism of Hasidism's Tanya and the general transformational models of alchemy. This formal model is in opposition to the messianic tradition in Jewish thought and analyzes Freud and Durkheim as anti messianic social psychologists. Hasidism offers a template for modern theories of social psychology, social interaction and the relation between the social and the individual, that is, collective identity. This essay also considers more generally how modern social theory might make sense of contemporary social phenomena by opening itself to the messianic and mystical traditions in Jewish thought. I suggest that the social and structural transformation associated with the information or network society requires new analytic tools that allow us to explain social energy differently to the way Freud and Durkheim have guided social theory. Contemporary analyses of individualization, social movements and sacralization as forms of and reactions to alienation are inadequate. Instead, I ask whether we should not 'restore a messianic, truly utopian "lost unity", which the alchemical, secular gnosis of modern social science displaced, and so renew social theory?'