In this paper it is argued that the roots of Augustine’s ecclesiological critique of the Donatists can be traced back to his view of the place of Christ in salvation history. In order to elaborate this thesis, his way of reading biblical history is explored. Augustine uses a scheme of promise and fulfillment: God the Word promises in the Old Testament, God the Word who became flesh, fulfils this promise in the New. By the priestly office of the Old Testament He promises reconciliation between God en his people, he fulfils this promise by assuming this office and sacrificing himself in the New. He promises universal blessing through the Davidic King and fulfils this promise by his ascension and the world-wide spread of the gospel.