He also warned those to whom he addressed his pastoral letter against two errors. One is heresy, attacks against the traditional faith. He saw as a defence against that the traditional Latin liturgy and liturgical discipline that the apostolic administration keeps. The other error is schism, attacks against the unity of governance of the church. Members of the apostolic administration must be on their guard against this too, he said, especially since their rightful efforts to preserve the Catholic faith had some unfortunate effects, in particular the onset of