Magisterium Monday lessons, PDFs, and quizzes.https://magisteriummonday.com/en-ushttps://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