"Lord show us the Father, and we will be satisfied."
People always want to know God. The disciples had the privilege to watch and talk with Jesus. Even though they believed that He is the Son of the Most High, it was difficult for them to understand that anyone who sees Jesus also sees the Father, which, with Jesus equates to God the Father. I guess they felt privileged being apostles, and believed that it would allow them to see God. This however, was not so.
In response, to Philip , "who saw me, saw also the Father." Jesus says: "if you want to know who is God and what is God, look at me.
Answering Philip in this way, Jesus talks about how to know God.
First, by reason. Three years living in the presence of Jesus should be enough. Surely the apostles were witnesses of His life, His witness and His miracles.
The second way is by faith. Many times Jesus asked the apostles to believe His words and deeds. So faith and reason is the way to know God. A place of this meeting is Jesus.
The Old Testament tells us, when we want to contemplate the face of God, when we want to meet Him, we must go to the temple. After the Resurrection of Jesus, is the temple in which we can stand before God. It is no longer the temple of Jerusalem, the temple of stone, but the glorified Body of Jesus.
That is why it is so important for us to be taking part in the Holy Mass. Every Eucharist is a real meeting with Jesus. If it is true that He feeds us with His flesh, we also become a place of meeting between God and man. We become a place where everyone who seeks God may find Him looking for us.