8 Philip said to Him: “Lord, show us the Father, and that is enough for us.”
9 Jesus said to him: “Philip, Have I been with you such a long time and have you not known Me? He who has seen Me has seen the Father. How can you say: “Show us the Father””?
Perhaps most of us have asked a question, which at the time we think is quite helpful and will open the eyes of our understanding. However, when the reply comes, we wish that we had not said anything.
We can only imagine that this is how Philip may have felt.
He thought he was asking a good question.
From the way in which Jesus had spoken to them about the Father, it appeared to Philip that it was a good idea to ask Jesus to show them the Father.
Maybe he thought that this was going to be a defining moment in their relationship with Jesus, and that they were about to get a deeper understanding of the Father, and that they were about to enter into a new dimension of relationship with the Father, which they had not known before.
Maybe we also ask the same question, wanting to discover more of the ways of Jesus, wanting a deeper relationship with the Father. These are good desires and we need to keep on looking to learn more about Him.
Moses made a similar request:
 Then Moses had one more request. “Please let me see Your glorious presence,” he said.
 The LORD replied, “I will make all My goodness pass before you, and I will call out My name, ‘the LORD,’ to you. I will show kindness to anyone I choose, and I will show mercy to anyone I choose” – Exodus 33.18-19 (NLT).
This request was met as God passed before Moses and the people of Israel.
During His sermon on the Mount Jesus said: “God blesses those whose hearts are pure, for they will see God” – Matthew 5.8 (NLT).
The reply of Jesus at the supper table was not to conceal the Father, but to point them to look to Him, because it is only in Him that the Father can be known.