Cover of A Summa of the Summa

Book Highlights

A Summa of the Summa

by Peter Kreeft

What it's about

Peter Kreeft distills the dense, scholastic brilliance of Thomas Aquinas’s Summa Theologica into accessible, modern English. He provides a curated selection of the original text paired with conversational commentary to prove that medieval theology remains punchy, logical, and deeply relevant to daily life.

Key ideas

  • Reasonable faith: Religious truth is inherently certain, and human doubt stems from the limitations of our own intellect rather than any flaw in the divine.
  • Practical philosophy: Aquinas approaches ethics with the same grounded, common-sense logic found in the teachings of Aristotle or a wise mentor.
  • Divine goodness: The existence of complex moral and physical realities is a direct expression of God's infinite, overflowing goodness.
  • Intellectual humility: Recognizing our own cognitive weaknesses is the necessary starting point for engaging with profound spiritual truths.

You'll love this book if...

  • You want to study Aquinas but feel intimidated by the sheer size and jargon of the original Summa.
  • You are looking for a bridge between rigorous classical philosophy and modern, everyday application.
  • You enjoy clear, direct arguments that challenge you to think harder about your own worldview.

Best for

Students and laypeople who want to sharpen their logical reasoning while exploring the foundations of Western Christian thought.

Books with the same vibe

  • Confessions by Saint Augustine
  • Orthodoxy by G.K. Chesterton
  • The Everlasting Man by G.K. Chesterton

3 popular highlights from this book

Key Insights & Memorable Quotes

The most popular highlights from A Summa of the Summa, saved by readers on Screvi.

St. Thomas is as practical and plain and reasonable in ethics as Aristotle, or Confucius, or your uncle.
is part of the infinite goodness of God, that He
Hence the fact that some happen to doubt about articles of faith is not due to the uncertain nature of the truths, but to the weakness of human intelligence;

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