The Father living in Jesus
In the past God had sent many prophets to the Jewish people, with messages from him. But Jesus is not merely the greatest of the prophets, he is the Son who is “the radiance of God’s glory and the exact representation of his being” (Heb.1:1-3.) He is not just the Father’s representative – rather the Son and the Father are so mutually indwelling that the words and works of Jesus are the words and works of the Father himself (10-11a; 10:30).
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So in Jesus we have not only the fullest possible revelation of God but the Father himself is the one who works through Jesus (10b). The confirmation of this is seen in the miracles that he did (11b; 3:2). In the other Gospels, the word for miracle is dunamis, meaning an act of power, but John prefers the words ergon (a work) and semeion (a sign) – the works of Jesus are signs which point to Jesus as the one who spoke and did the words and works of God (20:30-31).
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So far, Jesus has been emphasising that it’s his relationship with the Father which is the basis of his ministry. Having laid that foundation, he now begins to speak to the disciples about their own fruitful ministry, which will depend similarly on their being in him just as he is in the Father.