A Trinitarian heresy that says
God isn't three distinct Persons, but instead is
God in three different forms. This heresy isn't biblical because we see the Persons of the
Trinity interact with one another (Matthew 3:13-17).
Patrick: The Trinity is like
water, and how you can find
water in three different forms, liquid, and
ice, and vapor.
Donall: That's modalism, Patrick!