Looking back at the beginning of chapter 13, we see that Jesus is talking privately to four of his disciples--Peter, James, John, and Andrew. They are sitting on the Mount of Olives looking at the temple. By the time that Mark wrote this gospel, the temple had been destroyed. His first audience would have recognized the allusions to the destruction of the first temple and their exile.
Jesus said "Keep awake."' These words are meant for them, and they continue to be intended for us.
God had created a good world. We human beings had failed at our responsibilities. The old ways have to go. A new way is coming. God desires for us to live in a world transformed. Keep awake.