Here's a nice bit by Bavinck about Augustine. Remember, this is Bolt's abridgement:
But, in Augustine, that grace only works within the boundaries of the visible church and its sacraments. The church is an institution of salvation, a dispenser of grace, the seat of authority, the guarantor of Scripture, the dwelling place of love, a creation of the Spirit - indeed, the very kingdom of God. Augustine sensed, deeply, the importance of community to religion. The church is the mother of believers. It is difficult to harmonize Augustine's doctrines of predestination and grace with this concept of church and sacrament. "Many who seem to be outside are inside, and many who are inside seem to be outside." There are sheep outside the sheepfold and wolves inside it. Both Roman Catholics and Protestants, with some justification, appeal to Augustine. Rome appeals to him for its doctrine of the church, the sacraments, and authority, while the Reformation felt kinship with him in the doctrine of predestination and grace. He is the theologian of the greatest importance for all theological work that comes after him. Every reformation returns to him and to Paul. For every dogma, he found a formula that was taken over and repeated by everyone else. His influence extends to all churches, schools of theology, and sects. Augustine, therefore, does not belong to one church but to all churches together. He is the universal teacher (Doctor universalis). Even philosophy neglects him to its own detriment. And, because of his elegant and fascinating style, his refined, precise, highly individual and, nevertheless, universally human way of expressing himself, more than any other church father, he can still be appreciated today. He is the most Christian as well as the most modern of all the Fathers. Of all of them, he is closest to us. He replaced the aesthetic worldview with an ethical one, the classical with the Christian. In dogmatic theology, we owe our best, our deepest, our richest thoughts to him. Augustine has been and is *the* dogmatician of the Christian church. (p. 38, slightly edited)