Don't work for the food which perishes, but for the food which remains to eternal life, which the Son of Man will give to you. For God the Father has sealed him."

 The real difficulty of Christianity is two-fold. It demands an act of surrender to Christ, an acceptance of him as the final authority; and it demands a moral standard of the highest level. The disciples were well aware that Jesus had claimed to be the very life and mind of God come down to earth; their difficulty was to accept that as true, with all its implications. To this day many a man refuses Christ, not because he puzzles intellect, but because he challenges his life. 