‘Give us this day our daily bread.” These words may be taken either spiritually or literally, because, in the divine plan, both readings are helpful for salvation. The bread of life is Christ; now, this is not everyone’s bread but it is ours…we call this ‘our bread’ because Christ is the bread of those who partake of His body. And we ask that this bread be given us daily, lest we, who live in Christ and receive the Eucharist every day as the food of salvation, be separated from His body by some grave sin that keeps us from communion and so deprives us of our heavenly bread.
St. Cyprian of Carthage. The Lord’s Prayer, 18. B#41, p. 53.