When the children of Israel were wandering through the wilderness they awoke each morning to the Lord's provision of manna. In a similar way, the sparrows eat. This also seems to be how Jesus suggests that we might best be provided for. However, just like the children of Israel, many of us do not like daily bread. With daily bread you don't pick the menu, you can't save it up and it is rarely more than you need. This is not how we prefer to eat. We want to see bread before we eat today's bread.
Daily bread, however, does not mean “bad bread” The sparrows, though not in control of the menu, eat really well. (Just like the lilies, though not in control of the wardrobe, out-dress the splendor of Solomon). The people of God have never eaten better than when they have lived by faith, sought first God's kingdom and awoke each morning -hungering for God's provisions.