The Church’s official doctrine, in fact, provides the irreplaceable interpretative key to the post-synodal apostolic exhortation, so that it may truly serve the good of all the faithful, uniting them ever more closely to Christ Who alone is our salvation. There can be no opposition or contradiction between the Church’s doctrine and her pastoral practice, since, as the Catechism reminds us, doctrine is inherently pastoral:
The mission of the Magisterium is linked to the definitive nature of the covenant established by God with his people in Christ. It is this Magisterium’s task to preserve God’s people from deviations and defections and to guarantee them the objective possibility of professing the true faith without error. Thus the pastoral duty of the Magisterium is aimed at seeing to it that the People of God abides in the truth that liberates (890).
It may be helpful to illustrate one example of the need to interpret the text of Amoris Laetitia with the key of the magisterium. There is frequent reference in the document to the “ideal” of marriage. Such a description of marriage can be misleading. It could lead the reader to think of marriage as an eternal idea to which, in the changing historical circumstances, man and woman more or less conform. But Christian marriage is not an idea; it is a sacrament which confers the grace upon a man and woman to live in faithful, permanent and procreative love of each other. Every Christian couple who validly marry receive, from the moment of their consent, the grace to live the love which they pledge to each other.
Because we all suffer the effects of original sin and because the world in which we live advocates a completely different understanding of marriage, the married suffer temptations to betray the objective reality of their love. But Christ always gives the grace for them to remain faithful to that love until death. The only thing that can limit them in their faithful response is their failure to respond to the grace given them in the sacrament of Holy Matrimony. In other words, their struggle is not with some idea imposed upon them by the Church. Their struggle is with the forces which would lead them to betray the reality of Christ’s life within them.