The Word of God
[The Reformed] identified Scripture as the Word of God, but they also very clearly recognized that Word was, ultimately, the identity of the second person of the Trinity. They also recognized that the second person of the Trinity, as Word, was the agent of divine revelation throughout all ages...
Richard A. Muller, Post-Reformation Reformed Dogmatics: The Rise and Development of Reformed Orthodoxy; Volume 2: The Cognitive Foundation of Theology, 2nd ed. (Grand Rapids, MI: Baker Academic, 2003), 182.