Sheen was a remarkable evangelist and catechist. I think that an even simpler explanation is that unique claim of Christianity that God is love. A Jew or a non-Catholic might claim that God loves, but they stop short of saying that God is love. We too say that God loves, but love is not just something that God does, it is the essence of who He is.
Drawing on what Sheen said and sprinkling in some Chesterton, that dogma of Christianity is absolutely the basis for the existence of the Trinity because if you say that if God is love you are acknowledging that within the very being of God is a Lover (God the Father) a Beloved (God the Son) and the Love between them (God the Holy Spirit). The closest parallel is that of a marriage. In a marriage there is a husband, there is a wife and there is the love between them all three embodied within one an indissoluble creation of the marriage.
Peace be with you
True. As Bishop Sheen correctly stated.. Nuptials are very important in understanding covenants in Scripture.. God calls Israel His Spouse etc.. and as Bishop Sheen says... "How did old humanity begin? Nuptials. How did the new humanity begin? Nuptials. Jesus, the new Adam, looked down from the Cross at the new Eve. The Church was born from His side.