Our fathers ate the manna in the wilderness. As it is written, 'He gave them bread out of heaven{Greek and Hebrew use the same word for "heaven", "the heavens", "the sky", and "the air".} to eat.'"

 Jesus put his command in one sentence. "Don't work for the food which perishes but for that which lasts for ever and gives eternal life." Long ago a prophet called Isaiah had asked: "Why do you spend your money for that which is not bread? and your labour for that which does not satisfy?" ( Isaiah 55:2). There are two kinds of hunger. There is physical hunger which physical food can satisfy; but there is a spiritual hunger which that food can never satisfy. A man may be as rich as Croesus and still have an incompleteness in his life. 