“It is the bread the Lord has given you to eat."
God is providing for His people and teaching them to come to Him, to depend on Him and to take from the source of eternal life. He desires eternal life for us in relationship with Him.
When a problem arises grumbling seems automatic to me because in my own limited way I see no solution. But through Yahshua, the bread that came down from heaven, trust in Yahweh is being developed. In hard times I am learning to go to Him in prayer and trust that He is in control and will sort it all out. Sometimes I am even thanking Him in advance of seeing the resolution. In quiet times I am in His Word, learning of His faithfulness and love and that strengthens my heart just as a meal strengthens my body.