32. The existence of the divine Trinity is made very clear by the Lord’s words in Matthew:

Jesus said, “Go forth and make disciples of all the nations, baptizing them in the name of the Father, the Son, and the Holy Spirit.” (Matthew 28:19)

The existence of the Trinity is also made clear by the following words in Matthew:

When Jesus was being baptized, behold, the heavens were opened and he saw the Holy Spirit coming down like a dove upon him; and a voice from heaven said, “This is my beloved Son, in whom I am well pleased.” (Matthew 3:16, 17)

The reason why the Lord sent his disciples forth to baptize people in the name of the Father, Son, and Holy Spirit was that this divine trinity existed within him in his then-glorified state. In the verse preceding the quotation from Matthew 28 just given, the Lord says, “All power has been given to me in heaven and on earth” (Matthew 28:18); and in the verse following, he says, “Behold I am with you all the days, even to the close of the age” (Matthew 28:20). In these verses, then, he mentions only himself and not three persons. In John we read, “There was not the Holy Spirit yet because Jesus was not yet glorified” (John 7:39). He made the statement in Matthew after he was glorified, and his glorification was when he became fully united with his Father, the divinity that had been inside him since conception. The Holy Spirit was the divine quality that emanated from him once he was glorified (John 20:22).

19. 2 In fact, in regard to the four theological points just listed, Roman Catholics before the Reformation had exactly the same teachings as Protestants did after it. That is, Catholics had the same teachings regarding the trinity of persons in the Divine, the same teachings regarding original sin, the same teachings regarding the assigning of Christ’s merit, and the same teachings regarding our being justified by believing that we are assigned Christ’s merit; the only difference was that Catholics united that faith to goodwill or good works.