Sunday, May 26 is the Solemnity of the Most Holy Trinity. In his 1988 apostolic letter Mulieris Dignitatem, Bl. John Paul II wrote about the likeness between the Trinity and human persons.
Bl. John Paul II: God, who allows himself to be known by human beings through Christ, is the unity of the Trinity: unity in communion. In this way new light is also thrown on man’s image and likeness to God, spoken of in the book of Genesis. [link] The fact that man “created as man and woman” is the image of God means not only that each of them individually is like God, as a rational and free being. It also means that man and woman, created as a “unity of the two” in their common humanity, are called to live in a communion of love, and in this way to mirror in the world the communion of love that is in God, through which the Three Persons love each other in the intimate mystery of the one divine life.