Today the Church invites us to contemplate the Most Holy Trinity as Jesus introduced us to it. God’s love is ‘not in the oneness of a single Person, but in the Trinity of one substance.’ The mystery of the Most Holy Trinity is the central mystery of Christian faith and life. (It is the mystery of God in Himself – a God who is “one but not solitary”). God is the Creator and merciful Father; He is the only begotten Son, who died and rose for us; He is the Holy Spirit who moves all things. Three persons who are one God because the Father is love, the Son is love, the Spirit is love.
Each is wholly God. God does not live in splendid solitude but rather is an inexhaustible source of life that is ceaselessly given and communicated. Profession of faith in the Trinity is what in the last analysis makes us Christians.The ‘name’ of the Blessed Trinity is, in a certain sense, imprinted upon all things because all that exists is in relation; in this way we catch a glimpse of God as relationship and ultimately, Creator Love. (Pope Emeritus Benedict XVI; CCC 234).