Two things stand out in this remarkable book of Father Meyer: its complete fidelity to the principles of Catholic philosophy and theology, and its clear and objective presentation of the methods by which the resources of Christian teaching may be brought to bear on the problems of modern times. Father Meyer is no mere theorist. He speaks from a background of practical experience, gained in discouraging contact with the saddest form of human perversion. He has a deep and comprehensive understanding of the works of Catholic Action which have developed in this our day as the Church's organized opposition to atheism and immorality.