The doctrine of the Trinity tells us there is “One Being, three Persons.” Of course, it’s more complicated than all that, but we’ll leave it there! In this definition, what is a “person?” That’s a hard question. Two main views are common today; the classical model and the social model. The Church has traditionally held to the classical view. However, if you ask the right questions, you’ll likely find most Christians actually believe in the social model.
Why does this matter? Well, because it’s probably the most practical question you can ask about the Trinity! If the Scriptures show us three Persons who relate to one another in the Gospels, it’s important to know what “Person” means. If you hear “Person” and think of an autonomous individual with his own self-consciousness and will, then you don’t believe in the classical view, you’re at odds with all the great creeds of the Church, and you’ve abandoned the Nicene and post-Nicene understanding of God. Depending on who you ask, you may be a heretic.
Are you interested, now?
Classical view of personhood
The Church has done most of the heavy lifting about divine Personhood in the context of Christology, so we ought to begin there. That first Christmas, the divine Son added a human nature to His divine nature. That’s why we confess that Jesus is one divine Person with two natures.1