“The Cappadocian arguments against the Eunomians were many, complex and subtle; but perhaps the most effective was the simplest: if it is the Son who joins us to the Father, and only God can join us to God, then the Son is God; and if, in the sacraments of the Church and the life of faith, it is the Spirit who joins us to the Son, and only God can join us to God, then the Spirit too must be God.”