To believe in God is the most fundamental affirmation of our faith and everything we do should flow from this belief. But we don’t just believe in one God among many, either as preference, or in exclusive relationship, or even as one above all other gods. “I am God, and there is no other …” No, we declare our faith in ONE, unique God; i.e. there is only one God.
As an extension of this faith, we profess that God’s oneness means there is no division in God; God doesn’t have parts, nor is God a mixture of substances: God is GOD and nothing else. Which also means that nothing else can be God; Creation is not God (a belief called Pantheism); the collective spirits of persons aren’t God (or godsparks divided among us, elements of this idea are found in Gnosticism and Hinduism); no is anything else. This faith in God’s oneness, we share with Judaism and Islam who have guarded this fundamental faith with devotion above all else.
Jesus affirms we must love ONE LORD with all our heart, and with all our mind, and with all our strength. He also reveals that he himself is “the Lord.” But our confession of Jesus as Lord and the Holy Spirit as “Lord and giver of life” introduces no division in our faith in One God. God is one in nature, and essence, and substance. There are Three Divine persons, but they are inseparable in what they are, “consubstantial”, which is God. The Trinity is One.
What does faith in ONE God mean for us?
God the creator’s Oneness reveals his greatness and majesty; nothing else in our life is God, and therefor nothing in our life should be revered as God is revered. If God is one, then there is only one source of everything we are and everything that have, and thus to God alone we give our ultimate thanks. If God alone is one, and we are all made in the image and likeness of God, then there is a unity and incomparable dignity among all persons that we must live by. If God alone made all things, then we must treat all of Creation only in ways that bring us closer to God, and detach ourselves from anything that turns us away from God.
It means trusting God in every circumstance, no matter the adversity:
“Let nothing trouble you /
Let nothing frighten you
God never changes
Patience obtains all
Whoever has God
Wants for nothing
God alone is enough.”
—St Teresa of Avila
To learn more about the God’s ONENESS, you can read more in the Catechism of the Catholic Church, HERE.