In The Divine Trinunity of the Father, Son, and Holy Spirit, Francis Cheynell draws out the doctrine of the Trinity (or as he calls it, "Trinunity") and its major implications. He reasons from Scripture to prove that the true God, Jehovah, is Triune rather than Unitarian, that all three persons of the Godhead are one God, and are three rather than one or four persons, that Jesus Christ is eternally generated by the Father, and that the Holy Spirit is breathed out eternally by the Father and the Son. Cheynell draws from across church history, citing the likes of Augustine, Athanasius, Basil, Gregory of Nyssa, and others, as well as more recent Reformation-era authors such as John Calvin, Theodore Beza, John Jewel, and James Ussher. Given the proliferation of anti-Trinitarian heresies in our day, this work is as relevant as ever.