This book discusses Griffith Jones's High Church ministry and theology, which developed into mass evangelism in Wales. It considers Jones's background, his life as a parson, preaching in Welsh and educational interests, as well as his determination to remain within the Church of England. Bishop George Bull's concerns about evangelism, influence of the Prayer Book and Continental Pietism, 'conversionism', and the tendency to separatism are also discussed. Jones may not have been an original thinker, but he was an untiring communicator and organiser. There are sections on Jones's catechising, 'baptismal covenant', and moderate Calvinism which influenced later Welsh Calvinistic Methodism. Jones's advocacy of the Welsh language, especially with English donors to his schools, his links with the SPCK, and collaboration with gentry – especially Sir John Philipps and Bridget Bevan – show the effectiveness with which he participated in the growing evangelical movement in Wales.