St. Augustine (354-430), greatest of the Church Fathers, continues to exercise a unique and profound influence upon the intellectual history of the West after more than fifteen hundred years. Pioneer in the theology of Grace and in a psychological understanding of the Trinity, his impact upon subsequent theological speculation, Protestant as well as Catholic, has been unrivaled. The timeless and timely character of his teaching is perhaps nowhere more apparent than in the documents of the Second Vatican Council where the African Bishop is cited more frequently than any other Father or Doctor of the Church. "Founder of Christian philosophy", his principles and method have largely inspired the rise of such diversified currents of contemporary thought as existentialism, philosophic spiritualism, and personalism. The three works included in the present volume range over a period of some forty years, from Augustine's days as a neo-convert and priest to the closing years of his life as Bishop, and offer representative examples of his rich and versatile genius as Christian pedagogue, philosopher, and theologian.