9 “Give us this day our daily bread.” Now here it is manifest, that it is for ourselves we pray. When you say, “Hallowed be Your Name,” it requires explanation how it is that it is for yourself you pray, not for God. When you say, “Your will be done;” here again is there need of explanation, lest you think that you are wishing well to God in this prayer, that His will may be done, and not rather that you are praying for yourself. When you say, “Your kingdom come;” this again must be explained, lest you think that you are wishing well to God in this prayer that He may reign.
But from this place and onwards to the end of the Prayer, it is plain that we are praying to God for our own selves. When you say, “Give us this day our daily bread,” you profess yourself to be God's beggar. But be not ashamed at this; how rich soever any man be on earth, he is still God's beggar. The beggar takes his stand before the rich man's house; but the rich man himself stands before the door of the great rich One. Petition is made to him, and he makes his petition. If he were not in need, he would not knock at the ears of God in prayer.
And what does the rich man need? I am bold to say, the rich man needs even daily bread. For how is it that he has abundance of all things? Whence but because God has given it him? What should he have, if God withdrew His hand? Have not many laid down to sleep in wealth, and risen up in beggary? And that he does not want, is due to God's mercy, not to his own power.
Source: Sermons on Selected Lessons of the New Testament (New Advent)