Summa Theologiæ

St. Thomas Aquinas

This beginners' textbook in theology, never finished by St. Thomas Aquinas, sets out to summarize the entirety of sacred theology. Used as the primary teacher of sacred theology in seminaries for centuries, it had the unique privilege of being kept open on the altar during the Council of Trent, so that the fathers of the Council could always and immediately draw from its wisdom, the only book besides the Sacred Scriptures themselves accorded this honor. The great Leo XIII, of happy memory, stated in his encyclical Æterni Patris that St. Thomas Aquinas should be the basis for any Catholic philosophical and theological education, and this is the greatest of St. Thomas's works. Its value cannot be overstated.

Prima Pars (PDF) (free)

Prima Secundæ (PDF) (free)

Secunda Secundæ (PDF) (free)

Tertia Pars (PDF) (free)

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