Once again, Jesus urges all his disciples to take him at his word. I am in the Father and the Father is in me.
He is saying, hold on to that. Do not doubt it any longer. And if you find it so difficult to believe, remember the miraculous signs you saw that I performed. This began at the wedding at Cana: water that turned into superior wine (John 2:9–10). As the first in a long series, he thus manifested his glory
(John 2:11; see also John 5:8–9). Therefore, on the day of Pentecost, Peter, moved by the Holy Spirit, said, Men of Israel, hear these words: Jesus of Nazareth, a man attested to you by God with mighty works and wonders and signs that God did through him in your midst, as you know
(Acts 2:22). It is crystal clear, as Peter testifies, that God was at work in Jesus.
Jesus himself was always aware of this. He knew that the Father was working in him and enabling him to perform all those great deeds. This should have been an incentive for the disciples then—and for us now—to believe that there is a unique bond between him and the Father. In Jesus, we encounter God. The Son is completely familiar with the Father. Whoever is with him is with God, and whoever has met him has met God.
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11 Croyez-moi, je suis dans le Père, et le Père est en moi; croyez du moins à cause de ces œuvres.