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How do we really know God is a Trinity of Persons?

By Dr. Jeff Mirus ( bio - articles - email ) | May 28, 2019 | In Video Lectures

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In this presentation, Dr. Jeff Mirus explains how we know that God is a Trinity of Persons (three persons in one God), how we can at least begin to understand this mystery, and how important it is to an understanding of human life and love.

This is the fourth video in the “How do we really know” series. The list of Scripture citations covered in the video are available for download in the links below, along with additional reading on this rich theological topic.

In addition to the ten resources listed below, which include the list of citations used in the lecture, I would recommend reading Pope Saint John Paul II’s 1986 encyclical on the Holy Spirit for greater insight into the Trinity: Dominum et vivificantem (Lord and Giver of Life).

There are some technical improvements in this fourth effort. I believe the audio has been improved, and I have forsaken an old-school whiteboard (which was used very little) for a more informative video-generated whiteboard technique.


  1. List of Scripture references and other resources on the Trinity cited in this lecture.
  2. Hilary of Poitiers, On the Trinity, Books I-III (ca. 360 AD)
  3. Hilary of Poitiers, On the Trinity, Books IV-VII (ca. 360 AD)
  4. Hilary of Poitiers, On the Trinity, Books VIII-XII (ca. 360 AD)
  5. Basil the Great, Letter CCCLX: On the Holy Trinity, the Incarnation, etc. (ca. 360AD)
  6. Gregory of Nyssa, On the Holy Trinity, and of the Godhead of the Holy Spirit (ca 380 AD)
  7. Augustine of Hippo, On the Trinity (420 AD)
  8. Jeff Mirus, “God’s Community of Love—and Ours”
  9. Jeff Mirus, “Why Be Catholic? 6: Divine Intimacy”
  10. Jeff Mirus, “Personal Limitations and the Trinity”

Previous in series: How do we really know the pope has Christ’s authority in the Church?

Jeffrey Mirus holds a Ph.D. in intellectual history from Princeton University. A co-founder of Christendom College, he also pioneered Catholic Internet services. He is the founder of Trinity Communications and See full bio.

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