Tier 1Canontreatise
Summa Theologiae
St. Thomas Aquinas · 1265–1274
Hub page for Aquinas's Summa — the masterwork of medieval theology, indexed by part and question.
In Hoc Signo Vinces
The Scriptorium
Scripture, councils, Doctors, approved revelation, and commentary — each marked by authority so nothing is confused with the Magisterium.
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Tier 1Canontreatise
Summa Theologiae I, Q.2, A.3 — Whether God exists
St. Thomas Aquinas · 1265–1274
Aquinas's five ways — the classical demonstration that God exists, from the Summa Theologiae.