1 I think that it may now be considered clear to every one, that the authority of the blessed Cyprian for the maintenance of the bond of peace, and the avoiding of any violation of that most wholesome charity which preserves unity in the Church, may be urged on our side rather than on the side of the Donatists. For if they have chosen to act upon his example in rebaptizing Catholics, because he thought that heretics ought to be baptized on joining the Catholic Church, shall not we rather follow his example, whereby he laid down a manifest rule that one ought in no wise, by the establishment of a separate communion, to secede from the Catholic communion, that is, from the body of Christians dispersed throughout the world, even on the admission of evil and sacrilegious men, since he was unwilling even to remove from the right of communion those whom he considered to have received sacrilegious men without baptism into the Catholic communion, saying, "Judging no one, nor depriving any of the right of communion if he differ from us?"
Source: On Baptism, Against the Donatists (New Advent)