Magisterium Monday lessons, PDFs, and quizzes.https://magisteriummonday.com/en-ushttps://magisteriummonday.com/entries/2026-05-18-aeterni-patris/https://magisteriummonday.com/entries/2026-05-18-aeterni-patris/Part I of two: Leo XIII's case for philosophy as the servant of faith and his survey of the patristic-to-early-Scholastic witnesses (§§ 1–16).Mon, 18 May 2026 00:00:00 GMTleo-xiiiencyclicalscholasticismaquinasratio-et-fidesthomistic-revivalhttps://magisteriummonday.com/entries/2026-05-11-de-principiis-naturae/https://magisteriummonday.com/entries/2026-05-11-de-principiis-naturae/Lesson materials for St. Thomas's early treatise on matter, form, privation, the four causes, act and potency, and the order of the categories.Mon, 11 May 2026 00:00:00 GMTaquinasmetaphysicsnatural philosophyprinciplescauses