Summa Theologica by Thomas Aquinas A monumental theological work systematically exploring Christian doctrine. Aquinas addresses topics such as the nature of God, morality, sin, and salvation using philosophical reasoning, blending faith and logic in a comprehensive guide to medieval Christian theology.

Thomas Aquinas (1225-1274) was a medieval philosopher and theologian, best known for Summa Theologica. He integrated Aristotelian philosophy with Christian theology, shaping Catholic doctr ...