Heidelberg Catechism, Lord’s Day 50
[Even the simple act of asking for daily bread is an act of worship. The chances are that nobody reading this lives with a daily concern that they will not have enough to eat—people with access to the Internet usually also have access to breakfast—but if anything that makes it all the more important that we pray this particular line of the Lord's Prayer. Why? Because we, of all people, need to know that "you are the only source of everything good," and to "give up our trust in creatures and trust in you alone." Some of us assume that we have secured for ourselves bread by means of our diligence; others are anxious lest we haven't. Heidelberg says: stop it. "Neither our work and worry, nor your gifts, can do us any good without your blessing." Absolutely.]
Q125. What does the fourth petition mean?
A125. “Give us this day our daily bread” means:
Do take care of all our physical needs
so that we come to know
that you are the only source of everything good,
and that neither our work and worry
nor your gifts
can do us any good without your blessing.
And so help us to give up our trust in creatures
and trust in you alone.