The angel who has been speaking to John about the wonderful topic of the wedding of the Lamb states a benediction. He says that those who are invited to the marriage supper are blessed. This is not a reference to the general call of the gospel in which everyone is invited to believe in Jesus. Instead the invitations to the marriage feast are sent to those who, in line with the illustration of a Jewish marriage, have already signed the agreement and are now in the meantime waiting for the feast to begin. In a mixing of metaphors, the members of the Bride are now the guests.
Those who would have read this statement from this book for the first time would have been going through difficult circumstances connected to persecution and other problems connected to their profession of faith in Jesus. We could say that their making of the wedding garments was bringing them great trouble. They needed to hear divine consolation and comfort. And they are reminded that, despite their circumstances, they are truly blessed.
Most believers have had their embarrassing moments. Sometimes they have them when they have been listening to amazing news. John here has one when he attempts to worship the angel. Maybe he was so caught up in the glorious description that he forgot the messenger was not the subject of his message. Yet even the rebuke he received was a statement of assurance because John was told that he was still a servant of God and a member of his family, and because he was such he had an invitation to the wedding. We can learn from the method of the angel how we are to correct one another.
Good angels and converted humans share one purpose, which is to testify to Jesus. His glory is their common theme, and instead of bowing to an angel John should have joined him in bowing before God. This is our testimony too as we speak in a prophetic manner to the world as we wait for the wedding to take place.