2 Corinthians 4:6 reads,
For God, who said, “Let light shine out of darkness,” made his light shine in our hearts to give us the light of the knowledge of the glory of God in the face of Christ. 
A famous sermon entitled “THE FACE OF JESUS, is based on this passage of Scripture. It was preached by R.G. Lee, who also preached PAYDAY-SOME DAY. What a privilege to come to God in intimate prayer, and let him shine into our hearts the light of the knowledge of the glory of God in the face of Jesus.
I recently heard Vince Vitale, with the Oxford Centre for Christian Apologetics talk about the face of God. Vitale said he liked to think of understanding God like seeing a face. You could never describe every detail and moving nuance of a face to someone else. You would have trouble describing it clearly enough for someone to recognize it on sight. The only way to grasp a face is to look at a person, to meet them face to face. He went on to say that in the times that he was plagued with doubts he realized that he was trying to understand God intellectually. And God is far too complex to fully understand that way. He would then begin to seek God face to face in prayer and scripture. When we pray we come face to face with God.