Summa Theologiae Prima Pars, 50-119 (Latin-English Opera Omnia)

The most important work of the towering intellectual of the Middle Ages, Thomas Aquinas's Summa Theologiae remains one of the great seminal works of philosophy and theology, while extending to subjects as diverse as law and government, sacraments and liturgy, and psychology and ethics. Aquinas continues his Summa Theologiae with meditations on persons, both spiritual and corporeal, angels and humans.

• Summa Theologiae Prima Pars, 1-49 (Latin-English Opera Omnia)
• Summa Theologiae Prima Secundae, 1-70 (Latin-English Opera Omnia)
• Summa Theologiae Secunda Secundae, 92-189 (Latin-English Opera Omnia)
• Summa Theologiae Secunda Secundae, 1-91 (Latin-English Opera Omnia)
• Summa Theologiae Prima Secundae, 71-114 (Latin-English Opera Omnia)
• Summa Theologiae Tertia Pars, 1-59 (Latin-English Opera Omnia)
• Summa Theologiae Tertia Pars, 60-90 (Latin-English Opera Omnia)
• Summa Theologiae Supplementum 69-99 (Latin-English Opera Omnia)
• Summa Theologiae Supplementum 1-68 (Latin-English Opera Omnia)
• Early Christian Doctrines: Revised Edition