And according as we say, "Our Father," because He is The Father of those who understand and believe; so also we call it "our Bread," because Christ is The Bread of those who are in union with His Body. And we ask that this Bread should be given to us daily, that we who are in Christ, and daily receive The Eucharist for the Food of Salvation, may not by the interposition of some heinous sin...be separated from Christ's Body.

The Writings of Cyprian, Bishop of Carthage (ed. 1868)