The book of Revelation, and indeed other parts of the New Testament, are filled with warnings about how close Jesus’ coming is. The prophet John was warned not to conceal this prophecy from the public, since it describes things that will take place soon:
Then he told me, “Do not seal up the words of the prophecy of this scroll, because the time is near.11 Let the one who does wrong continue to do wrong; let the vile person continue to be vile; let the one who does right continue to do right; and let the holy person continue to be holy.”
The angel who is talking to John here reminds us that evil, rebellious people will not heed the commands of this book. Rather, “the one who does wrong” can be expected to “continue to do wrong.” He will ignore John’s warning. However, likewise “the one who does right” can be expected to “continue to do right.” This is because God will encourage and sustain those who are holy and give them the power to continue to do what is right. One of the ways that God sustains the righteous is through the warnings of this book. He reminds them that the end is near, and that they need to keep living for Christ every day.