The Summa Theologiae (or Summa Theologica) of St. Thomas Aquinas (c. 1225–1274), written 1265–1274 and left unfinished at his death. Translated by the Fathers of the English Dominican Province (Second and Revised Edition, 1920); public domain. Text from New Advent.
The work is arranged in Parts, each divided into Questions, each Question into Articles. Every Article poses a question, states Objections, gives the sed contra (“On the contrary”), Aquinas’s own answer (“I answer that”), and Replies to the Objections.
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Parts
- Prima Pars — 119 questions. Sacred doctrine, the One God, the Trinity, creation, the angels, man, divine government.
- Prima Secundæ — 114 questions. Man’s last end, human acts, passions, habits, virtues and vices, law, grace.
- Secunda Secundæ — 189 questions. The theological and cardinal virtues, and states of life, treated in detail.
- Tertia Pars — 90 questions. The Incarnation, the life of Christ, and the sacraments (Baptism, Confirmation, Eucharist, Penance).
- Supplementum — 99 questions. Completed from Aquinas’s earlier writings: Penance (continued), the Resurrection, and the last things.