No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father…Therefore, keep watch, because you do not know on what day your Lord will come. Matthew 24:36, 42
These two verses will cause no shortage of consternation among my readers. That's fine. Wise and more scholarly men than I have debated the meaning of these kinds of texts for ages and have still come to different conclusion.
These verses talk about Jesus' second coming to Earth. We know it's going to happen; we just don't know when. We get a sense of what it will look like here (Mark 13 and Luke 21 seem to indicate that there will be great deception, life anxieties, drunkenness, and false prophets), which probably has happened throughout the ages. The difference is that there will be an increase in those activities. It doesn't take too much imagination to see that today – and it's getting worse.
However, we also see many Believers in this generation waiting eagerly for His return. There's an expectancy, an urgency. Witness, for instance, the underground church in China. They have a vision to reach the Muslim world, a mission field that we in the West have almost written off as too difficult! We can certainly learn for their enthusiasm.
Keep watch, because you do not know on what day your Lord will come.