Roland Allen is internationally renowned for his controversial solutions to dilemmas within churches and missions. His works were first written in the initial decade of the twentieth century, yet their ideas are so radical that they are still relevant today. Indeed, Allen predicted that his principles would not be broadly accepted until around fifty years after their creation. This selection of works by this mission pioneer and creative thinker takes extracts from Allen's other writings, which although having potential to be just as influential as those better known, have long been out of print. It is now the present-day reader's chance to investigate the theories within texts such as: Pentecost and the World, Non-Professional Missionaries, Mission Activities Considered in Relation to the Manifestation of the Spirit, St. Paul and the Judaizers: A Dialogue, An Illustration from V.S. Azariah, The Case for Voluntary Clergy and To the Parishioners of Chalfont St. Peter. Throughout all of these writings is Allen's central belief that the Holy Spirit is a driving force in the Church.