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We profess the belief that there is only one God because he has revealed himself to the people of Israel as the only One when he said, "Hear, O Israel: the Lord your God is one Lord" [Deuteronomy 6:4], and "there is no other" [Isaiah 45:22]. Jesus himself confirmed that God is "the one Lord" [Mark 12:29]. To profess that Jesus and the Holy Spirit are also God and Lord does not introduce any division in to the one God.
Ref. CCC 200-202, 228
Taken From The Compendium - Catechism Of The Catholic ChurchRead More
At the Last Supper with his apostles on the eve of his passion Jesus anticipated, that is, both symbolized his free self-offering and made it really present: “This is my Body which is given for you” (Luke 22:19), “This is my Blood which is poured out...” (Matthew 26:28) Thus he both instituted the Eucharist as the “memorial” (1 Corinthians 11:25) of his sacrifice and instituted his apostles as priests of the new covenant. Please click here to learn more about Holy Mass, also known as the celebration of the Holy Eucharist.