Augustine’s ideas became the Catholic church’s bulwarks against all forms of sectarian and schismatic reform. Even the “magisterial” reformers (Luther, Zwingli, Calvin, Cranmer) accepted most of Augustine’s answers to Donatism, though they all rejected ex opere operato, arguing that recipients of the Eucharist must have faith for grace to be effective. The Anabaptists, on the other hand, rejected these ideas and repeated Donatism’s insistence on a pure, or at least regenerate, church. Of human bondage