A Topic of Moral Theology
Perfect and Essential Goodness
Perfect and Essential Goodness, as treated in McHugh–Callan (Art. 3. Acts as Moral).
In the manuals
Moral Theology: A Complete Course (McHugh & Callan)
Vol. I, Pt. I, Q. I, Art. 3. Acts as Moral, Perfect and Essential Goodness, nn. 87 & 88 (2 passages — hover a number to read it)
Treated under the broader heading The Necessity of Acting for the Sake of an End — Wouters, Manual of Moral Theology · Merkelbach, Summa Theologiae Moralis — these works do not divide the matter as finely as we do here, so their treatment stands one heading up (ed.)