Where is the word Trinity in the Bible? You won’t find it! The Trinity is a mystery revealed by God and handed on to us through Sacred Tradition (see Catechism of the Catholic Church, 78, 234).
Jesus provides trinitarian clues in the Bible. “If you love Me and obey the commands I give you, I will ask the Father and He will give you another Paraclete — to be with you always: the Spirit of truth, Whom the world cannot accept, since it neither sees Him nor recognizes Him; but you can recognize Him, because He remains with you and will be within you” (Jn 14:15-17).
God is one essence in three Persons. The greatest minds in the history of the Church have wrestled with understanding the Trinity. We’ll never be able to fully grasp this divine truth. But as beloved children of the Father (1 Jn 3:2), our starting point is trust. Let the Lord speak to your heart; focus on the relationships. God is eternal community. Love best illuminates the nature of the Trinity (see 1 Jn 4:8, 16).
God the Father chose us (Eph 1:4). Jesus, our older Brother, leads us (Heb 2:10-11). The Holy Spirit resides within us (1 Cor 6:19). Grow strong through prayer in the Holy Spirit, persevere in God’s love, and welcome the mercy of Jesus (see Jude 20-21). Immerse yourself in the Trinitarian love of God.