HOMILY OF ST JEROME, PRIEST, ON MATTHEW 28:16-20
After his resurrection, Jesus was seen on a mountain in Galilee, and he was adored there; and though some doubted, their doubts increase our faith. Then he showed himself more openly to Thomas, pointing to his side, wounded with the spear, and to the prints of the nails in his hands. Jesus, coming, spoke to them, saying: “All power in heaven and on earth has been given to me.” To him is this power given, who but a little while before had been crucified, buried in the sepulchre, lain there dead, and afterwards had risen again. And power is given to him in heaven and on earth, so that he who before had reigned in heaven, might now also on earth, through the faith of those who believe.
THE NAME OF THE TRINITY IS THE NAME OF THE ONE, ONLY GOD
“Go, therefore, and make disciples of all nations, baptising them in the name of the Father, and of the Son, and of the Holy Spirit.” First, they teach all nations, and then, having taught them, they baptise them with water. For the body cannot receive the sacrament of Baptism unless the soul has already received the truth of faith. They are baptised in the name of the Father, and of the Son, and of the Holy Spirit, that there may be oneness in the giving, as there is oneness in the divinity; for the name of the Trinity is the name of the one, only God.
“TEACHING THEM TO OBSERVE ALL THAT I HAVE COMMANDED YOU”
“Teaching them to observe all that I have commanded you.” This arrangement is important; he commanded the apostles, first to teach all nations, then to steep them in the sacrament of faith, and after imparting faith and administering baptism, to instruct them in the precepts they must observe. And lest we should think these precepts few in number, and of small importance, he added: “All things whatsoever I have commanded you”; so that all those who had believed and been baptised in the Trinity, should do all those things that are commanded. “And behold, I am with you even to the consummation of the world.” He who promises to be with his disciples even to the consummation of the world, also shows them that they will live forever, and that he will never depart from those who believe in him.
– St Jerome, Book 4, Commentary on Matthew; An Approved English Translation of the Breviarium Romanum, Burns & Oates, London, 1964