Moses wants to see the glory of God. Every man is awed by the thought of looking God in the face and gazing upon that most powerful being. Yet God declares that it is impossible for man to look upon the face of God and live. So the best Moses can view is the back of God while hearing his name and character uttered aloud.
This is the great difference with the incarnation. For in the incarnation, God becomes human welding the divine nature with the human nature for the rest of eternity. By performing this mysterious wonder, humanity is able to gaze upon the face of God, as Jesus says,
Anyone who has seen me has seen the Father (John 14:9)
I and the Father are One (John 10:30)
No longer are we hidden from God’s face, but in Christ we are daily in his presence. We are able to boldly.
Let us approach the throne of grace with confidence, so that we may receive mercy and find grace to help us in our time of need (Hebrews 4:16)
Therefore, rejoice Christian for in Christ you have seen the face of God and he is smiling upon you as a brother and as a loving Father, in fact more than that, he is living inside you constantly leading you to be conformed to the image of the Son.