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."

 It may be well that we should remember that here John is doing what he so often does. He is not giving, or trying to give, the actual words of Jesus. He has been thinking for seventy years of what Jesus said; and now, led by the Holy Spirit, he is giving the inner significance of his words. It is not the words that he reports; that would merely have been a feat of memory. It is the essential meaning of the words; that is the guidance of the Holy Spirit. 