From the dawn of humanity to the present day we have employed various mythologies, rituals and practices to help us survive and make sense of the situations we face in the world we inhabit.
In the course of his work, Carl Gustav Jung (1875-1961) noticed that the basic themes in these human practices and beliefs were related to his dreams, visions and fantasies, as well as those of his patients. He found that the nature of psyche (like other aspects of the natural world) is largely common to humanity, and changes only slowly over millennia, though it expresses itself in a myriad different ways in different people over that time.
Jung suggested a (more or less) coherent set of ideas and concepts, a language, that could neutrally express some essential observations on the manifestations of the psyche and so enable a deeper understanding. In so doing, Jung and his collaborators gave birth to the field of analytical psychology.
Jung started his therapeutic work as a psychiatrist in Switzerland where he discovered that beyond the surface of the human personality lie energy structures that he called 'feeling-toned complexes'. These complexes enact the dynamics of the psyche and are rooted so deep that, when constellated (activated), they affect both the state of consciousness and the physiology of the individual. Jung went on to collaborate with Sigmund Freud in the founding of the field of psychoanalysis.
Jung's later explorations of himself, his clients and the manifestations of psyche in current events and historical documents resulted in his forging his own understanding of psyche and analytical psychology..