after hearing that, many of jesus disciples saying: "That is a hard word, who can hear it?" and jesus know what is in their heart, what his students grumble it, then jesus said to them: "is there any words that shake your faith? and how if you see the Son of man come with his throne where he had previously been? spirit alone which gives life, the flesh is totally not useful. the words what i say to you is spirit and life. but some among you not trust me. "because Jesus knew from the beginning who does not believe and who would betray him. and he said: "Therefore I tell you: no one can come to me, if the father did not gave it to him." starting from that time many of his disciples quit and no following him anymore.