The mystery of the Holy Trinity is beyond complete human understanding, but let me share one particular reason with you why we believe God is Holy Trinity.
God Lacks Nothing
God lacks nothing. He is full and complete. In fact, God is so full that His goodness overflows to us. His grace is “superabundant.”
If God were Father alone, then He would be lacking love because there must be more than one person for love to exist. Love does not exist in solitude.
Try to imagine loving if you were completely alone. Even if you could argue that you might love yourself, wouldn’t that be a selfish and imperfect kind of love (narcissism or vanity)? Without community there is no possibility of perfect love.
Therefore, if God lacks nothing, then He possesses perfect love (now and before Creation) and to possess perfect love means that God is more than one person. One God, Three Persons. He is a family of Father, Son and Holy Spirit.
Here are two Old Testament passages which tell us that that God is more than one person. The idea of Son and Holy Spirit is not fully developed in these verses, but I will discuss that another time.
The Creation of Mankind
“Then God said: ‘Let us make human beings in our image, after our likeness. Let them have dominion over the fish of the sea, the birds of the air, the tame animals, all the wild animals, and all the creatures that crawl on the earth.’ God created mankind in his image; in the image of God he created them; male and female he created them” (Gn 1:26-27).
The Tower of Babel
“The Lord came down to see the city and the tower that the people had built. Then the Lord said: ‘If now, while they are one people and all have the same language, they have started to do this, nothing they presume to do will be out of their reach. Come, let us go down and there confuse their language, so that no one will understand the speech of another'” (Gn 11:5-7).
See also the Catechism of the Catholic Church, CCC 253-256.
Some might say that references to “us” in the above Scriptures was God speaking with heavenly creatures, perhaps angels. However, that theory would not account for God being in solitude before the angelic creatures existed. It would also mean that God made man not in His own image alone, but also in the image of the heavenly creatures (“in our image, after our likeness”).
Notes and Bibliography:
Senior, Donald, John J. Collins, and Mary Ann Getty, eds. The Catholic Study Bible. 2nd ed. New York: Oxford University Press, 2011.
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