Jesus is both gate and shepherd. Perhaps the significance of this dual image will help us understand progressively where Jesus is taking us. Certainly Jesus wants to provide us with a new destination: heaven. We have to follow Him in order to arrive at that destination. Jesus is also the door however: we must step into him and through him in order to reach the place where He wants to finally lead us.
It shouldn’t surprise us that Jesus acts in different and progressively more direct and intimate ways as we grow in our Christian life. St. John provides us with the seven “I am”s of Christ to introduce us into the mystery of His manifold presence and action in our lives.