What does the Fourth Petition mean?

Give us this day our daily bread.

That is...

God gives daily bread indeed without our prayer even to the wicked; but we pray in this petition that He would help us to appreciate His benefits, that we may receive our daily bread with thanksgiving.

By daily bread is meant all those things which are needed for our support and well-being in life, as food and clothing, home and property, happy family relations, a good government, favorable weather, peace and health, faithful friends, good neighbors, and the like.