The Church’s proclamation on the family finds its foundation in the life and preaching of Jesus, who lived and grew up in the family of Nazareth. He attended the wedding at Cana, which he honoured by performing the first of his “signs” (cf. Jn 2:1-11) and presented himself as the Bridegroom who unites himself to his Bride (cf. Jn 3:29). On the cross, he gave himself up with a love to the very end and, in his resurrected body, established new relationships among people. By revealing the fullness of divine mercy, Jesus allows man and woman to recover that “principle” according to which God unites them in one flesh (cf. Mt 19:4-6) and for which — by the grace of Christ — they are enabled to be faithful to each other and love each other forever. Therefore, the divine measure of conjugal love, to which spouses are called by grace, has its source in “the beauty of the saving love of God made manifest in Jesus Christ who died and rose from the dead” (EG, 36), the very heart of the Gospel.
Jesus, in assuming human love, also perfected it (cf. GS, 49), giving man and woman a new manner of loving, which has its foundation in the irrevocable faithfulness of God. In light of this, the Letter to the Ephesians has identified in the married love between a man and a woman, “the great mystery” which makes present in this world the love between Christ and the Church (cf.Eph 5:31-32). A married couple possesses the charism (cf. 1 Cor 7:7) of building up the Church with their spousal love and the task of the procreation and rearing of children. United in an indissoluble sacramental bond, the spouses live the beauty of love, fatherhood and motherhood and the dignity of participating, in this way, in God’s creative work.
Throughout the centuries, the Church has maintained her constant teaching on marriage and family. One of the highest expressions of this teaching was proposed by the Second Vatican Council, in the Pastoral Constitution Gaudium et Spes, which devotes an entire chapter to promoting the dignity of marriage and the family (cf. GS, 47-52). This document defined marriage as a community of life and love (cf. GS, 48), placing love at the center of the family and manifesting, at the same time, the truth of this love in counter distinction to the various forms of reductionism present in contemporary culture. The “true love between husband and wife” (GS, 49) implies a mutual gift of self and includes and integrates the sexual and affective aspects, according to the divine plan (cf. GS, 48-49). Furthermore, Gaudium et Spes, 48 emphasizes the grounding of the spouses in Christ. Christ the Lord “comes into the lives of married Christians through the Sacrament of Matrimony,” and remains with them. In the Incarnation, he assumes human love, purifies it and brings it to fulfillment. Through his Spirit, he enables the bride and groom to live their love and makes that love permeate every part of their lives of faith, hope and charity. In this way, the bride and groom are, so to speak, consecrated and, through his grace, they build up the Body of Christ and are a domestic Church (cf. LG, 11), so that the Church, in order to fully understand her mystery, looks to the Christian family, which manifests her in a real way.
-Instrumentum Laboris, par. 2,3, & 4-
“The Pastoral Challenges of the Family in the Context of Evangelization” (in preparation for the Synod on the Family this fall)