Psychology literally means the study of psyche.
Psyche originally meant soul. Depth psychology, then, is in essence the study of the soul. Broadly conceived, depth psychology is that branch of psychology that places a special emphasis on the unconscious dimension of human experience. Depth psychologists argue that our modern emphasis on reason has cut us off from the soul and its wisdom, resulting in a collective loss of meaning. Through emphasizing the irrational, unconscious dimension of the psyche, depth psychologists invite us to journey down to those places where we can still hear the voice of God.