A name applied to the Godhead and signifying Three in One and One in Three—the Father, the Son, and the Holy Ghost—a doctrine which is held by all branches of the Catholic Church, and by the greater number of the various Christian denominations. The word "Trinity" is not found in the Bible and is said to have been first used by Theophilus, Bishop of Antioch, in the second century as a concise expression of the Christian Faith concerning the Godhead, that "there is but one living and true God, everlasting, without body, parts or passions; of infinite power, wisdom and goodness; the Maker and Preserver of all things both visible and invisible. And in the unity of this Godhead there be three Persons, of one substance, power and eternity: the Father, the Son, and the Holy Ghost." (Art. I). The doctrine of the Trinity deals with matter beyond reason but not contrary to reason; is the subject of Revelation and as such is proposed to our faith faculty. For this reason it is called a Mystery of the Gospel.