The doctrine of the Trinity is typically defined in a specific way:
“The Trinity is a mystery which cannot be comprehended by human reason but is understood only through faith and is best confessed in the words of the Athanasian Creed, which states that we worship one God in Trinity, and Trinity in unity, neither confusing the Persons nor dividing the substance, that we are compelled by the Christian truth to confess that each distinct Person is God and Lord, and that the deity of the Father, the Son and the Holy Spirit is one, equal in glory, coequal in majesty.”
“But his inmost Being as Holy Trinity is a mystery that is inaccessible to reason alone or even to Israel’s faith before the Incarnation of God’s Son and the sending of the Holy Spirit.”
However, a small fraction of people—like highly rational apologists—have attempted to approach the topic from a rational perspective (either to support or reject it). The following multi-part series on the Trinity examines the doctrine from the rational perspective.
Part 1: “James Attebury on the Trinity”
Part 2: “James White on the Trinity”
Part 3: “Bart Ehrman on the Trinity”
Part 4: “Bruce Charlton on the Trinity”
Part 5: “Attebury vs Charlton on the Trinity”
Part 6: “Jesse Albrecht on the Trinity”
Part 7: “Circular Reasoning on the Trinity”
Part 8: “Gnosticism, The Trinity, and the Dialectical Method”
Part 9: “Polytheists on the Trinity”
Part 10: “Bnonn Tennant on the Trinity”
The series is an expansion on the notions contained in these old articles:
“Grammatical Analysis of John 1:1c and John 1:14”
“When Did the Word Become Flesh in John 1:14?”
“The Trinity and The Protestants“