CatholicG33k YouTube channel is currently offline

Catholic Resources · Scholastic Theology

Summa Theologica

The Sacred Science of the Catholic Faith

Explore the complete Summa Theologica of St. Thomas Aquinas, a timeless guide to understanding God, humanity, Christian life, Christ, the sacraments, and our ultimate destiny.

Enter the Summa Read the Prologue
St. Thomas Aquinas writing beside an open theological volume
“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.” St. Thomas Aquinas, Prologue

Explore the Five Divisions

Choose a division to browse its complete question and article index.

  1. I

    Prima Pars

    — ☩ —

    Sacred doctrine, God, the Trinity, creation, angels, man, and divine government.

    Explore Prima Pars
  2. I–II

    Prima Secundæ

    — ☩ —

    Human happiness, acts, passions, habits, vice, sin, law, and grace.

    Explore Prima Secundæ
  3. II–II

    Secunda Secundæ

    — ☩ —

    Faith, hope, charity, prudence, justice, fortitude, temperance, and vocations.

    Explore Secunda Secundæ
  4. III

    Tertia Pars

    — ☩ —

    Christ, the Incarnation, his life, and the sacraments of the Church.

    Explore Tertia Pars
  5. SUP

    Supplementum

    — ☩ —

    Penance, Holy Orders, Matrimony, resurrection, judgment, and the last things.

    Explore the Supplement

Prologue: The Purpose of the Summa

St. Thomas explains that this work was written to instruct beginners in sacred doctrine with brevity, clarity, and an orderly method.

Read the Prologue

About This Edition

Translation

English translation by the Fathers of the English Dominican Province.

Source

The Second and Revised Edition published in AD 1920.

Presentation

Digitally organized and presented by CatholicG33k.