John 6:60-63

60Then many of his disciples, when they heard these things, said, “This is a difficult saying! Who can understand it?”

61When Jesus was aware that his disciples were complaining about this, he said to them, “Does this cause you to be offended?

62Then what if you see the Son of Man ascending where he was before?

63The Spirit is the one who gives life; human nature is of no help! The words that I have spoken to you are spirit and are life.