“Orate Fraters”, is the first of the seven “words” which the priest will speak clearly and audibly between now and his Communion. This corresponds to the Seven Last Words spoken by our Lord from the cross, as it is primarily during that part of the Mass – between the first “Orate” and the priest’s Communion – that His Passion will be re-presented.
In addressing us as “brethren”, the priest would have us understand that being one in mind and heart, united as a family in faith, hope and charity, we must unite the sacrifice of our lives to the Sacrifice he is offering to our Heavenly Father. We may pray for ourselves and for each other: “Lord Jesus Christ, who for love of us, wouldst suffer to be made a spectacle before thy enemies with their cries of ‘Crucify him!’ ‘Crucify him!’, give us grace to flee from vainglory and to even bear mockery and contempt for love of Thee. Amen.”
The better and more fervent our prayerful dispositions, the more agreeable will be our offering to God.
From the Roman Catholic Daily Missal, 1962 (St. Gregory the Great): “The Mass will be a sacrifice for us to God, when we have made an offering of ourselves.”