Youcat commented through CCC. Question n. 35 – Part V.

YOUCAT Question n. 35 - Part V. Do we believe in one God or in three Gods?

(Youcat answer - repeated) We believe in one God in three persons (Trinity). “God is not solitude but perfect communion.” (Pope Benedict XVI, May 22, 2005).      

A deepening through CCC

(CCC 256) St. Gregory of Nazianzus, also called "the Theologian", entrusts this summary of Trinitarian faith to the catechumens of Constantinople: Above all guard for me this great deposit of faith for which I live and fight, which I want to take with me as a companion, and which makes me bear all evils and despise all pleasures: I mean the profession of faith in the Father and the Son and the Holy Spirit. I entrust it to you today. By it I am soon going to plunge you into water and raise you up from it. I give it to you as the companion and patron of your whole life. I give you but one divinity and power, existing one in three, and containing the three in a distinct way. Divinity without disparity of substance or nature, without superior degree that raises up or inferior degree that casts down… the infinite co-naturality of three infinites. Each person considered in himself is entirely God… the three considered together…. I have not even begun to think of unity when the Trinity bathes me in its splendour. I have not even begun to think of the Trinity when unity grasps me  (St. Gregory of Nazianzus, Oratio 40, 41: PG 36, 417).      

Reflecting and meditating 

(Youcat comment) Christians do not worship three different Gods, but one single Being that is threefold and yet remains one. We know that God is triune from Jesus Christ: He, the Son, speaks about his Father in heaven (“I and the Father are one”, Jn 10:30). He prays to him and sends us the Holy Spirit, who is the love of the Father and the Son. That is why we are baptized “in the name of the Father and of the Son and of the Holy Spirit” (Mt 28:19).

(CCC Comment)

(CCC 266) "Now this is the Catholic faith: We worship one God in the Trinity and the Trinity in unity, without either confusing the persons or dividing the substance; for the person of the Father is one, the Son's is another, the Holy Spirit's another; but the Godhead of the Father, Son and Holy Spirit is one, their glory equal, their majesty coeternal" (Athanasian Creed: DS 75; ND 16). [End]  

(The next question is: Can we deduce logically that God is triune?)