It is, of course, a message that is all over the gospels. Matthew 24 tells us that not knowing the time of Jesus' return does not alter its certainty. Mark 13 sounds a warning to those who would somehow think He will not return. Luke 21 speaks plainly as it says, "Then they will see the Son of Man coming in a cloud with power and great glory." This message about Jesus returning to establish His reign is not something reported in a way that might lead to some skepticism, but was obviously spoken so much by Jesus with such seriousness that it it could not be ignored by those who were intent on communicating divine truth to the growing body of believers as well as the world around it.
As Advent begins, it is always with this message about Jesus coming to establish His Kingdom. The fact that so many think it to be a strange time to consider such a Word does not change its certainty. The One we only want to remember as a harmless, sweet babe in a manger will come again to bring to the world and its people divine accountability. The scripture makes it clear. He will come. As surely as He has come, so He will come again. And, so Advent reminds us to live as one who is each day ready for His appearing.