Chapter 1 has three main topics: the structure and aims of the Summa theologiae, faith and reason, and the type of demonstration Aquinas uses in the Five Ways. First, there is a look at the divisions of the Summa into (three) Parts, Treatises, Questions, and Articles. The articles are structured like a debate. The work’s Prologue suggests that Aquinas writes for students of theology but he well knows that his experienced peers in the Church and universities are interested in his theological positions. The chapter then treats his views on faith and reason, mainly in Summa theologiae Ia q.1. It looks at the nature of “sacred teaching” (sacra doctrina). A central theme is how Aquinas sees the legitimate findings of human reason as compatible with revelation, rightly interpreted. Finally, the chapter explains how Aquinas settles on a certain method of demonstrating God’s existence, called a demonstration “quia” or “that” God exists.