Let us not forget that conscience can be culpably deformed and harden itself in sin, resisting the saving action of God. That is why it is necessary to spread Christ's doctrine, the truths of faith and the norms of Christian morality. That is also why we need the sacraments, all of which were instituted by Jesus Christ as instrumental causes of his grace and remedies for the weaknesses that ensue from our fallen nature. Finally, that is why we need to receive frequently the sacraments of Penance and the Eucharist.

The awesome responsibility of all the Church's members and especially of its shepherds is made clear in Saint Paul's advice: I charge you in the presence of God and of Christ Jesus who is to judge the living and the dead, and in the name of his coming and of his kingdom: Preach the word, be urgent in season and out of season, convince, rebuke, and exhort, be unfailing in patience and in teaching. For the time is coming when people will not endure sound teaching, but having itching ears they will accumulate for themselves teachers to suit their own likings, and will turn away from listening to the truth and wander into myths.