"The Trinity, Practically Explained" argues that the doctrine is not an intellectual puzzle to be solved but an important practical necessity in the life of the Christian. The historical background of Arius and the Council of Nicaea is absent because the author's focus is on presenting the biblical arguments for the Trinity. His argument begins on the premise that only God can save but by showing that God the Father saves, Jesus the Son saves and the Holy Spirit saves, the inevitable conclusion is God is a Trinity. The impact of the Trinitarian God and our Trinitarian salvation impacts our worship, witness, ethics and hope. In his online biography, Macchia describes himself as an ecumenical theologian and his ecumenical approach can be seen in this well-written book which should find doctrinal agreement across denominational lines.