The term 'Inner Souls, to Jung' is a reference to the psychological concept of the anima and animus, which was developed by Swiss psychiatrist Carl Jung. The anima and animus are two parts of the unconscious mind that represent the feminine and masculine aspects of the psyche, respectively. The anima is the inner soul of a man, while the animus is the inner soul of a woman. Jung believed that these two parts of the unconscious mind were essential for psychological growth and development.