On the next day, the multitude that stood on the other side of the sea saw that there was no other boat there, except the one in which his disciples had embarked, and that Jesus hadn't entered with his disciples into the boat, but his disciples had gone away alone.

 It is little wonder that the disciples found the discourse of Jesus hard. The Greek word is skleros ( G4642) , which means not hard to understand; but hard to accept. The disciples knew quite well that Jesus had been claiming to be the very life of God come down from heaven, and that no one could live this life or face eternity without submitting to him. 