Augustine offers hermeneutics and homiletics in his "De doctrina christiana". He stresses the importance of humility in the study of Scripture. He also regards the duplex commandment of love in Matthew 22 as the heart of Christian faith. In Augustine’s hermeneutics, signs have an important role. God can communicate with the believer through the signs of the Scriptures. Thus, humility, love, and the knowledge of signs are an essential hermeneutical presupposition for a sound interpretation of the Scriptures. Although Augustine endorses some teaching of the Platonism of his time, he recasts it according to a theocentric doctrine of the Bible. Similarly, in a practical discipline, he modifies the classical theory of oratory in a Christian way. He underscores the meaning of diligent study of the Bible and prayer as more than mere human knowledge and oratory skills. As a concluding remark, Augustine encourages the interpreter and preacher of the Bible to seek a good manner of life and, most of all, to love God and neighbor.