Today the Church celebrates the Feast of the Most Holy Trinity. The Most Holy Trinity is an eternal exchange of life-giving love. Throughout history, God has shown humanity His selfless love. Christ has revealed the Father’s love in the power of the Holy Spirit. He has shown us the inner life of the Holy Trinity: a communion of persons, Father, Son and Holy Spirit. The Church is also a community of persons that shares in God’s Trinitarian life and love.
Marriage is a metaphor for God’s self-giving love. It is also a participation in it. Like all sacraments, Matrimony draws husbands and wives more deeply into the Trinitarian life of God. The Catechism of the Catholic Church teaches that “the Christian family is a communion of persons, a sign and image of the communion of the Father and the Son in the Holy Spirit” (CCC, 2205).
In marriage man and woman together image the Holy Trinity: “So God created man in his own image, in the image of God he created him; male and female he created them” (Gen 1:27). It is important to note that “man” in Hebrew is “adam” which is both singular and plural. The second creation story in Genesis 2 explains how this apparent contradiction can be: “Therefore a man leaves his father and his mother and cleaves to his wife, and they become one flesh” (Gen 2:24).
God is most fully imaged by the one-flesh union of man and woman in the Sacrament of Marriage. Both maleness and femaleness have their role in imaging God. Husband and wife image God by representing His permanent, exclusive covenant relationship with His people. They also image the Trinity’s fruitful love because when husband and wife are united as one in the marital embrace, their love can produce a third person, a child.
Have you thought of your marriage as an image of the Holy Trinity? By living out your marriage according to God’s plan, you are reflecting the total, permanent, exclusive, and fruitful love of the Most Holy Trinity. Ask God to fill you with this life-giving love so that it may shine forth from your marriage to enlighten a world which is confused on the meaning of marriage and has lost sight of the love of God for His people.
 United States Conference of Catholic Bishops, Pastor Letter Marriage – Life and Love in the Divine Plan (Washington, D.C. USCCB, 2009), p. 35-37.