Cassiodorus : As if you did not know that all human beings come from Adam and that it is written that the nations will believe in Christ, as it is said, "My house will be called a house of prayer for all nations." … The saints were uncircumcised before they were circumcised, and Abraham before circumcision had faith, since there is one God who justifies a circumcision of faith. And he proclaims that each nation ought to be saved through the faith of Christ, that is, by faith in him. — EXPOSITION OF Romans 3 Ephrem the Syrian : "And the sons of the foreigners who join themselves to the Lord, … these I will bring to my holy mountain and make them joyful in my house of prayer." These words refer to the church of the Gentiles, as the Lord himself explained to the Jews, and it is written in the Gospel, "My house shall be called the house of prayer for all nations." — COMMENTARY ON Isaiah 56:7 Jerome : Is it not written, "He says, 'My house shall be called a house of prayer for all the nations' "? We read this in Isaiah: "But you have made it a den of thieves." …Where we read, "You have made it a den of thieves," John's Gospel had instead, "You have made it a house of business." Wherever there are thieves, there is a house of trafficking. Would that it were applied only to the Jews and not the Christians! We would, indeed, weep for them but rejoice for ourselves. But now, in many places, the house of God, the house of the Father, has become a place of business.… I who am speaking and each one of you, priest, deacon or bishop, who yesterday was a poor man, who today is a rich man in the house of God! — HOMILIES ON Mark 83 (Mark 11:15-17) Jerome : (v. 6, 7.) And the sons of the stranger, who adhere to the Lord, to serve Him and love His name, to be His servants: everyone who keeps the Sabbath from defiling it, and holds fast (or holding) to my covenant, I will bring them to my holy mountain, and make them joyful in my house of prayer. LXX: And to the foreigners who have joined themselves to the Lord to serve Him and love His name, to be His servants ÷ both men and women ÷ and all who keep my Sabbaths without profaning them, and hold fast (or holding) to my covenant, I will bring them to my holy mountain, and make them joyful in my house of prayer. After eunuchs pass over to foreigners, whom he had previously mentioned, he also promises rewards to them: that if they serve him, and pass from servitude to the love of that name, they will be his servants: such was also the Apostle Paul, writing at the beginning of his Epistles: Paul, a servant of Jesus Christ (Rom, I, 1). And Moses, a servant of God (Heb. III). But what was added in the Septuagint: and female servants, we have marked with an asterisk. For it cannot happen that there be any diversity of sex in spiritual gifts: since in Christ Jesus there is no male or female; but all are one in him (John 17). We have already spoken about the Sabbath and the eternal covenant. Therefore, whoever does these things, God will bring him to his holy mountain, and he will be filled with joy in his house of prayer. The holy mountain, or the teachings of truth, and the confession of the Trinity: or the Lord himself, to whom in the last times (according to this same Isaiah and the prophet Micah) many nations will come together (Isaiah 2, Micah 4). The Church is the house of prayer, which is divided throughout the whole world, and not the Temple of the Jews, which was confined to the narrow confines of the land of Judea. — Commentary on Isaiah Leander of Seville : Heresies and schism spring from the source of evils and, therefore, whoever comes to unity returns from vice to nature; for just as it is natural for many to become one, so is it a vice to avoid the sweetness of brotherly love. Let us, then, with our whole hearts be lifted up in joy that Christ has restored to his friendship in a single church the people who perished from love of strife. In this church, the harmony of love will again receive them. Of this church, the prophet foretold, saying, "My house shall be called a house of prayer for all peoples." — HOMILIES ON THE TRIUMPH OF THE CHURCH