In this book, the author establishes a parallel between the natural family, the Church and the Holy Trinity. In successive chapters, beginning with Sacred Scripture and the writings of the Fathers of the Church, he analyzes the characteristics of the family formed by a man and a woman, from which children are born the fruit of love; he shows how God created the original family, Adam and Eve; he shows that the Church willed by God is an extended family; he explains that God, in his intimacy, is a family, that paternity and filiation come from Him; he analyzes the characteristics of God's alliances with the Jewish people.

He also describes how God is love, to the point of becoming man and dying for us; he shows that life is a struggle for love, and that in heaven God is love that satisfies without satiating. At the end of the book, he enters into the theme of the Church; in this divine institution formed by men, the person finds a family, whose visible head is the Pope, and the invisible one, the Holy Spirit. The author concludes the book by returning to the example with which he began, showing the similarity between the family, the Church and intra-Trinitarian life.