Paul's Epistle refers to a schism between four parties in the Corinthian church, of which two attached themselves to Paul and Apollos respectively, using their names (the third and fourth were Peter, identified as Cephas, and Jesus Christ himself). It is possible, though, that, as Msgr. Ronald Knox suggests, the parties were actually two, one claiming to follow Paul, the other claiming to follow Apollos. "It is surely probable that the adherents of St. Paul [...] alleged in defence of his orthodoxy the fact that he was in full agreement with, and in some sense commissioned by, the Apostolic College. Hence 'I am for Cephas'. [...] What reply was the faction of Apollos to make? It devised an expedient which has been imitated by sectaries more than once in later times; appealed behind the Apostolic College itself to him from whom the Apostolic College derived its dignity; 'I am for Christ'." Paul states that the schism arose because of the Corinthians' immaturity in faith.