After the feeding of the five thousand (John 6), the crowds were going to try to make Jesus their king (v. 15). Jesus withdrew to a mountain and the disciples headed toward Capernaum. Jesus went to the boat later that night walking on the water (v. 19). Once in Capernaum, the crowd that followed was there at the feeding of the five thousand; they were seeking Jesus for more physical food. Jesus tells them that they should be seeking the spiritual food that comes down from God and gives eternal life. The crowd also wanted to know what kind of work they were supposes to do to get eternal life. “Jesus answered and said to them, ‘This is the work of God, that you believe in Him whom He has sent.’ (v. 29)” The only work they had to do was believe.
The only access to God is through believing in Jesus and by doing this you will receive eternal life. Christ is the spiritual food that nourishes the soul like regular food is for the physical body. Jesus is the only bread that can satisfy your soul. Whenever you try to satisfy your soul with anything except Christ, it will leave you feeling empty and unsatisfied.