The Word became flesh and made his dwelling among us. We have seen his glory... John 1:14
(I have to apologise for the compilation effort but in the midst of driving five hours to Wagga and back to go to my Master's graduation on Monday, I came down with a nasty cold and am writing this from the lounge. Must be the end of term!)
God dwelling among us is a big deal. It was a big enough deal when God chose a people for himself and made his presence known to the Israelites as they wandered the desert after the Exodus, as fire by night and a cloud by day (Exodus 13:21). Then when the Israelites stopped they set up a tabernacle for God to dwell in, among his people (Exodus 40:34-35).
But when God spoke to his people, he spoke through prophets like Moses. Even then God in his full glory could not be seen by Moses. Moses even asks God if he can see him. God responds, 'But', he said, 'you cannot see my face, for no one may see me and live' (Exodus 33:20).
When John says in this verse that WE have seen his glory, he is talking about himself and the other disciples. They have seen his GLORY. They came face to face with God in a way that no one else has since sin entered the world.
Here we see the culmination of a long story. A story of restoration. A story of God making himself known to not just his own people, but the whole world. And not just a glimpse or a passing by, but as one of us. Incredible.