Lecture XVII

Only if one takes seriously all that follows from preexistence will one gain an accurate concept of the connection between the human soul and the human body. If you take any handbook of knowledge concerning the soul—one calls this psychology—you find all kinds of theories on how the soul works upon the body, and so forth. You would not become very knowledgeable through these theories, for they are abstract webs of thought, and when you are finished with them you don't know much more than you did before. For, in psychology, all kinds of hypotheses are merely set forth on how the soul affects the body.