But even in most parts of Christendom, the clear, majestic, person of God is blurred by considering him to be a triune God. You may have heard of this as the Holy Trinity, a dogma that is mysterious and hard to understand. For example, the booklet The Blessed Trinity says: “The dogma of the Blessed Trinity . . . is a mystery . . . It cannot be proved by reason . . . It cannot even be proved to be possible.”a (Italics theirs.) The booklet adds: “Proof, therefore, of a mystery consists in showing that it is contained in revelation, in Holy Scripture.”