Kant’s concept of the highest good proportionately unites virtue and happiness—the supreme goods of, respectively, the systems of freedom and of nature. A middle path between theological and secular interpretations of Kant’s highest good is possible if we disentangle two distinct roles played by God: a causal role in promoting the real unity of the highest good, i.e., its actualization; and a conceptual role in modeling its conceptual unity. The highest good is theological in the first case, but neutral—neither directly (...) theological nor secular—in the second. Reconstructing how Kant envisioned the conceptual unity of the highest good requires taking seriously his repeated reference to God as the highest original good, and to the best world as the highest derived good. If, as Kant thought, a moral God forms a triadic unity comprised of holiness, goodness, and divine justice, perhaps he assumed that the conceptual unity of the derived good is likewise triadic, comprised of virtue, happiness, and a form of justice that is not directly divine but “systemic,” designating the unity of the systems of nature and of freedom. Divine justice, in contrast, constitutes the real unity of the highest good. (shrink)