On the Trinity (Unabridged‪)‬

This book was written in Latin by Augustine of Hippo (354 - 430) to discuss the Trinity in relation to God the Word (logos). Even though it is not as well known as some of his other writings, it is considered by many to be his masterpiece and of more doctrinal importance than either the Confessions or the City of God.

St. Augustine is considered a saint in the Catholic Churches, the Eastern Orthodox Church, and the Anglican Communion. He is ranked among the doctors of the Church in the Roman Catholic Church. Many Protestants, especially Calvinists and Lutherans, esteem him as one of the theological fathers of the Protestant Reformation on account of his teachings on salvation and divine grace.