71. “Scripture and Tradition give us access to a knowledge of the Trinity, which is revealed with the features of a family. The family is the image of God, who is a communion of persons. At Christ’s baptism, the Father’s voice was heard, calling Jesus his beloved Son, and in this love we can recognize the Holy Spirit (cf. Mk 1:10-11). Jesus, who reconciled all things in himself and redeemed us from sin, not only returned marriage and the family to their original form, but also raised marriage to the sacramental sign of his love for the Church (cf. Mt 19:1-12; Mk 10:1-12; Eph 5:21-32). In the human family, gathered by Christ, ‘the image and likeness’ of the Most Holy Trinity (cf. Gen 1:26) has been restored, the mystery from which all true love flows. Through the Church, marriage and the family receive the grace of the Holy Spirit from Christ, in order to bear witness to the Gospel of God’s love”.(Relatio Finalis 2015, 38)
My takeaway here is grace. Marriage and family give the human being an opportunity to encounter the grace of God.
For your reference, remember that Amoris Laetitia is online here.