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.'"
Isn't that interesting? What work can you do to be pleasing to God? The only work you can do is just believe in Jesus. That's what pleases the Father. This is the work of God, that you believe on Him whom He hath sent.