The construction of the Cartesian System as a rival to the Scholastic Summa
René Descartes wrote his third book, Principles of Philosophy, as something of a rival to scholastic textbooks. He prided himself in “that those who have not yet learned the philosophy of the schools will learn it more easily from this book than from their teachers, because by the same means they will learn to scorn it, and even the most mediocre teachers will be capable of teaching my philosophy by means of this book alone” (Descartes to Marin Mersenne, December 1640).