“Now the plain truth is that he who has never been tried by suffering and has never experienced the power of the Word of God to give strength, cannot know the true purport of this petition [i.e., “Give us this day our daily bread”]. Such comfort cannot appeal to him, for he has known and tasted only his own and other creatures’ comfort and aid. He has never drunk a cup of woe to the dregs and been disconsolate.”
Luther, Martin. “An Exposition of the Lord’s Prayer for Simple Laymen” (1519) Luther’s Works Vol. 42. Philadelphia: Fortress Press, 1969, page 53.