One Lord, One Faith, One Baptism

"The Faith declares that there is one God, seeing that there is one belief in the Old and the New Testament. That there is one Spirit, all holy, grace witnesseth, because there is one Baptism, in the Name of the Trinity. The prophets proclaim, the apostles hear, the voice of one God." St Ambrose, "Of the Christian Faith" Book I. Chap. IV