Trinity is the three ways the One God relates himself to us.
God is ultimately unknowable (we’ll never fully know him), but he wants us to know him. He wants a relationship with every one of us.
God created us for relationship with him and with all. Persons relate to one another, and in his Three Persons, God relates himself to us. God is love. And God is all that is good.
As Father, he relates his love and goodness to us by giving us, his children, all we need in his creation, including in the people he brings into our lives.
As Son, he relates his love and goodness to us in knowable human terms, in his humanity. In ways we can get to know the unknowable God and grow to trust and love him. And in ways we can follow and learn to live in his love, embrace his goodness and mercy, and share his love and mercy with others.
As the Holy Spirit, he relates his love and goodness to us spiritually, within us and among us. As we become more open to his guidance, open to his grace (the gifts of the Holy Spirit), we come to more often see him and his goodness in his creation, in others, and in ourselves. And as we cooperate with his grace his interior spiritual guidance, we allow him to share his love, his goodness, and his mercy through us with others.
No Person of God is lesser than any other Person of God and no Person of God is greater than any other Person of God (a common misconception even among faithful Catholics…). Each Person of God is fully God, the One True God, relating himself - his love, his goodness, his mercy - to us in every conceivable way so as to draw each of us into an eternal relationship of love with him and, through him, with all.
