Why cannot the authority of the Roman Catholic Church give to the universal Church false doctrines, false liturgical practices, and false disciplines?
Precisely because it is the authority of Christ. The Pope is assisted by the Holy Ghost in the promulgation of dogma and morals, and in the enactment of liturgical laws and pastoral disciplines. In the same way that it is unimaginable that Christ could promulgate these errors or enact these sinful disciplines, so it is unimaginable that the assistance which He gives to the Church through the Holy Ghost could permit such things. Hence, the fact that the Vatican II popes have done these things is a certain sign that they have do not have the authority of Christ. The teachings of Vatican II and the reforms which proceed from it are contrary to the Faith and ruinous of our eternal salvation. But since the Church is both indefectible and infallible, it cannot give to the faithful doctrines, laws, liturgy, and disciplines which are contrary to the Faith and ruinous of our eternal salvation. We must therefore conclude that this Council and these reforms do not proceed from the Church, that is
