Therefore, stay awake, for you do not know on what day your Lord is coming. But know this, that if the master of the house had known in what part of the night the thief was coming, he would have stayed awake and would not have let his house be broken into. Therefore you also must be ready, for the Son of Man is coming at an hour you do not expect.Matthew 24:42-44
This tells us how to be aware of the coming of Jesus. Some will be looking toward the Heavens while others for various signs, all the while going on with life as usual, unprepared. For he will come as a thief in the night, unexpected as to the time and circumstance of His appearance.
This tells us how important it is for all of us to keep our lives ordered so that when He does come, whether we are living or dead, we will be accepted. No fairer a warning and purpose is there for us as He is telling us exactly how to prepare for His second coming. Live as a Christian and all will work out.