After becoming popular and attracting many followers, Jesus taught about what we call the Incarnation, the Son of God becoming human flesh. The Incarnation made it possible for people to have eternal life. Instead of being overjoyed at this news, many so-called followers turned away from Jesus in John 6:41-71. After asking the his original followers if they also wanted to leave him, Peter responded with a question that can serve as a lifeline to us when we find it difficult to believe. (full sermon notes)
To be ready for Jesus' coming, we need to be doing what he has already told us to do.
Jesus announced that the hour had come for him to be glorified, but his glorification would begin with a cross.
Because humans were dead in our sins, the only possible solution was for God to make us alive because of his grace.