They're the words from the kingdom song 'Be Glad you Nations with his People'. Don't know if that's significant at all. Pretty sure it's not a pre - 1914 song, I'm not that old.
What is surprising is that I remember it after being out for 27 years. That's indoctrination for you!
Perhaps they are are targeting people who remember the song and are thinking how much longer to the end?
Who knows!