CATHOLIC RESOURCES · SACRED THEOLOGY

Summa Theologica

The Complete Five-Part Work of St. Thomas Aquinas

Because the doctor of Catholic truth ought not only to teach the proficient, but also to instruct beginners—according to the Apostle, “As unto little ones in Christ, I gave you milk to drink, not meat” (1 Corinthians 3:1–2)—we purpose in this book to treat of whatever belongs to the Christian religion, in such a way as may tend to the instruction of beginners.

We have considered that students in this doctrine have not seldom been hampered by what they have found written by other authors: partly on account of the multiplication of useless questions, articles, and arguments; partly because the things they need to know are not taught according to the order of the subject matter, but according as the plan of a book might require or the occasion of an argument offer; and partly because frequent repetition brought weariness and confusion to the minds of readers.

Endeavouring to avoid these and other like faults, we shall try, by God’s help, to set forth whatever is included in this sacred doctrine as briefly and clearly as the matter itself may allow.

The Five Parts

Select a part to enter the complete CatholicG33k edition of the Summa Theologica.

  1. Prima Pars: Sacred Doctrine, God, the Trinity, creation, angels, and man Prima ParsEnter Part I Sacred Doctrine. The One God. The Blessed Trinity. Creation. The Angels. The Six Days. Man. The Government of Creatures.
  2. Prima Secundæ Partis: man's last end, human acts, passions, habits, sin, law, and grace Prima SecundæEnter Part I–II Man’s Last End. Human Acts. Passions. Habits. Vice and Sin. Law. Grace.
  3. Secunda Secundæ Partis: faith, hope, charity, prudence, justice, fortitude, and temperance Secunda SecundæEnter Part II–II Faith. Hope. Charity. Prudence. Justice. Fortitude. Temperance. Acts Which Pertain to Certain Men.
  4. Tertia Pars: the Incarnation, life of Christ, and the sacraments Tertia ParsEnter Part III The Incarnation. The Life of Christ. Sacraments. Baptism. Confirmation. The Holy Eucharist. Penance.
  5. Supplementum: penance, extreme unction, holy orders, matrimony, resurrection, and appendices SupplementumEnter Supplement Penance continued. Extreme Unction. Holy Orders. Matrimony. The Resurrection. Appendices.