Jesus tells them that the scriptures had to be fulfilled. Then he does a wonderful thing; he opens their eyes, their understanding, to all that he has taught and said. This is the effect of the resurrection, Jesus can now let the disciples know what he was really teaching. His part of the mission is now over.
Jesus shall soon return to leave (the Ascension); and the work of the Holy Spirit shall begin. And the Spirit shall tell us today all about Jesus if we but listen!