Theme: Discernment, illumination, and rightly ordered delight guard the soul. These three readings form a tight pastoral sequence: in Tertullian (Chapters 4–6) we hear apostolic warnings against heresy and schism and are reminded that heresy is often a willful turning away from the apostolic rule; Augustine (Book 11, Ch. 3) amplifies that warning by locating true illumination in the Creator’s light—what the first “Let there be light” signifies for the spiritual creature; and Aquinas (Question 10) completes the arc by explaining enjoyment as a willful rest in a good apprehended by the intellect. Put together they teach us how to discern false teachers (test their conformity to apostolic doctrine), how to seek the transforming light that makes created goods intelligible, and how to train the will to enjoy rightly so that desire does not become a sp ...