"Blessed," says He, "are the peacemakers; for they shall be called the sons of God." [Matthew 5:9] It behooves the sons of God to be peacemakers, gentle in heart, simple in speech, agreeing in affection, faithfully linked to one another in the bonds of unanimity.
This unanimity formerly prevailed among the apostles; and thus the new assembly of believers, keeping the Lord's commandments, maintained its charity. Divine Scripture proves this, when it says, "But the multitude of them which believed were of one heart and of one soul." [Acts 4:32] And again: "These all continued with one mind in prayer with the women, and Mary the mother of Jesus, and with His brethren." [Acts 1:14] And thus they prayed with effectual prayers; thus they were able with confidence to obtain whatever they asked from the Lord's mercy.
Before all things, the Teacher of peace and the Master of unity would not have prayer to be made singly and individually, as for one who prays to pray for himself alone. For we say not "My Father, which art in heaven," nor "Give me this day my daily bread; "nor does each one ask that only his own debt should be forgiven him; nor does he request for himself alone that he may not be led into temptation, and delivered from evil. Our prayer is public and common; and when we pray, we pray not for one, but for the whole people, because we the whole people are one. The God of peace and the Teacher of concord, who taught unity, willed that one should thus pray for all, even as He Himself bore us all in one... Thus also we find that the apostles, with the disciples, prayed after the Lord's ascension: "They all," says the Scripture, "continued with one accord in prayer, with the women, and Mary who was the mother of Jesus, and with His brethren." [Acts 1:14] They continued with one accord in prayer, declaring both by the urgency and by the agreement of their praying, that God, "who makes men to dwell of one mind in a house," only admits into the divine and eternal home those among whom prayer is unanimous.
"These were all continuing with one accord in prayer together with the women." For this is a powerful weapon in temptations; and to this they had been trained. "Continuing with one accord." Good. Besides, the present temptation directed them to this: for they exceedingly feared the Jews. "With the women," it is said: for he had said that they had followed Him: "and with Mary the mother of Jesus." How then is it said, that "that disciple" took her to his own home, at that time? But then the Lord had brought them together again, and so returned.
"And they continued," it is said, "with one accord in prayer." Do you see how watchful they were? "Continuing in prayer," and "with one accord," as it were with one soul, continuing therein: two things reported in their praise.
"And Mary the Mother of Jesus and His brethren." Now Joseph perhaps was dead: for it is not to be supposed that when the brethren had become believers, Joseph believed not; he who in fact had believed before any. Certain it is that we nowhere find him looking upon Christ as man merely.
They sought by a swift path, with which it was possible to go a mile on their sabbath, the well-known walls where Mary, the gateway of God, the virgin mother of her Creator, formed by her own son, was sitting at a religious gathering. The second virgin put to flight the woes of Eve’s crime; there is no harm done to the sex; she restored what the first took away. Let grief not raise up complaints or vex mourning hearts with groaning over the old law; these very forms of wickedness and crime rather cause delight at this bargain, and a better lot comes to the redeemed world from the fall. The person, not the nature [of a woman], caused ruin; in those days [of Eve] a pregnant woman [brought forth] peril. In these [of Mary] one grew great to bring forth God, the one begetting mortal things and the other bearing divine—she through whom the Mediator came forth into the world and carried actual flesh to the heavens.
All these were continually devoting themselves with one accord to prayer. Those who patiently continue in prayer are those who await the arrival of the Holy Spirit. For the Holy Spirit of discipline flees from deceit (Wisdom 1). Therefore, whoever desires to receive the promised gifts of the Holy Spirit must persist diligently in prayers steeped in fraternal love.
With the women and Mary the mother of Jesus, and his brothers. It says brothers of Jesus, not of Mary. For in Greek there is a clear distinction where it is written not αὐτῆς but αὐτοῦ, which without any doubt is a masculine pronoun among them. Blessed Luke took care to inform readers that the brothers of the Lord were participants in his faith at that time, about whom it was previously said before his passion: "Neither did his brothers believe in him."
[AD 258] Cyprian on Acts 1:14
This unanimity formerly prevailed among the apostles; and thus the new assembly of believers, keeping the Lord's commandments, maintained its charity. Divine Scripture proves this, when it says, "But the multitude of them which believed were of one heart and of one soul." [Acts 4:32] And again: "These all continued with one mind in prayer with the women, and Mary the mother of Jesus, and with His brethren." [Acts 1:14] And thus they prayed with effectual prayers; thus they were able with confidence to obtain whatever they asked from the Lord's mercy.