https://www.crosswalk.com/faith/bible-study/the-doctrine-of-the-trinity-11531192.html
The Doctrine of the Trinity Explained | Crosswalk.com
Learn about the Holy Trinity and how God the Father, Jesus Christ the Son, Holy Spirit are one. Biblical truths and Christian doctrine central to the Christian...
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https://www.huntington.org/collections/lib-29215
[The doctrine of the Blessed Trinity briefly explained, in a letter to a friend | Collections | The...