Philip said, “Lord, show us the Father and that will be enough for us.”
Jesus answered: “Don’t you know me, Philip, even after I have been among you such a long time? Anyone who has seen me has seen the Father. How can you say, ‘Show us the Father’? Don’t you believe that I am in the Father, and that the Father is in me? The words I say to you I do not speak on my own authority. Rather, it is the Father, living in me, who is doing his work. Believe me when I say that I am in the Father and the Father is in me; or at least believe on the evidence of the works themselves. Very truly I tell you, whoever believes in me will do the works I have been doing, and they will do even greater things than these, because I am going to the Father. And I will do whatever you ask in my name, so that the Father may be glorified in the Son. You may ask me for anything in my name, and I will do it.
“If you love me, keep my commands. And I will ask the Father, and he will give you another advocate to help you and be with you forever—the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you. - John 14:8-17
"The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you."
Wouldn't it be nice if when people saw us that we were indistinguishable from Jesus?
Philip asks "Show us the Father and that will be enough for us." And Jesus reponds by saying, in essence, "Wouldn't it be nice if when people saw me, I was indistinguishable from the Father? If you have seen me, you have the seen the Father." When Jesus spoke and did things, he didn't do them on his own, but he was perfectly in line with what the Father would do. Jesus felt that this conclusion (that he and the Father were one) was a natural one what the disciples had seen over the previous 3 years.
And he says it can go even deeper, into the uncharted territory, when Jesus' disciples were left on their own with only the his teaching and the Spirit as guides. Not only would they be doing the same things Jesus would do, but in fact, they would exceed him. That's pretty hard to imagine, doing better than Jesus. But let's look at one way this was clearly true in the next generation after Jesus died: Jesus spent his entire ministry in Israel but soon after his disciples would represent Jesus to the entire Roman empire, exceeding what Jesus did.
But there is still another level of faith. Jesus comments that the Spirit is coming. No one would be able to see or hear the Spirit (see John 3) except those who were Jesus' disciples. So if Philip had trouble "seeing" the Father, how much more trouble would he have with seeing the Spirit. That's not what happened, though. We can see the book of Acts (Acts 8) that Philip was listening to God's message ("Now an angel of the Lord said to Philip")” and when his job was done, the Spirit moved him on ("the Spirit of the Lord suddenly took Philip away").
How does this work? Jesus spelled it out: "f you love me, keep my commands. And I will ask the Father, and he will give you another advocate to help you and be with you forever—the Spirit of truth." We keep God's commands and he directs the Spirit to stay with us. We have to trust that the Spirit is there and pay attention to his guidance. Otherwise we will be like Philip, still asking Jesus to "show us the Father" when he has already given us the Spirit right inside us.