Carl Gustav Jung (1875–1961) - Swiss psychologist, psychotherapist, philosopher, sociologist and cultural scientist - one of the outstanding scientists of the twentieth century, student of Sigmund Freud, founder of analytical psychology and psychotherapy, founder and president of the Swiss Society of Practical Psychology. In the present The collection presents works that introduce the reader to the fundamental theoretical principles and main working hypotheses of the author. In these works, Jung outlines his ideas about psychic energy and transcendental function, about instincts and the unconscious, and presents an overview of the theory of complexes and the original concept of libido.