Doxa is the Greek word for glory, standing behind our words doxology and orthodoxy. It speaks of the visible splendour and honour of God — the radiance of his presence, the weight of his worth. When John writes we beheld his glory, he means that in Jesus the very glory of God became visible among us, full of grace and truth.
Remarkably, Scripture says God shares his glory with his people: we are being changed from glory to glory into the image of Christ, and the sufferings of now are not worthy to be compared with the glory to come. All creation exists for doxa — to give God the honour due his name. To glorify God is simply to live for the weight and worth of who he is.
Doxa in Scripture
And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.