The Commission for Ecumenism of the Catholic Diocese of Auckland presents its 2020 Talk Series Promoting Christian Unity. A talk by Rev. Dr. Mervyn Duffy, SM on "Baptism and the Common Christian Faith." The mainstream Christian churches all recognize Baptism done by each other. What are the ecumenical implications of this? If we can all celebrate the same sacrament, is not the same Holy Spirit at work in all the churches?