Matthew 24:30 "...and they will see the Son of Man coming on the clouds of heaven with power and great glory."
As we live here on earth, we strive to live Christian life-styles and do what is right. One of the key aspects of our faith is that we believe there will be a second coming one day. Though we do not know when that specific day will be, we can be sure that it WILL in fact happen. I think it's a good idea to remind ourselves often what God's word says about this day.
1 Thess. 4:16 "For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and the trumpet of God. And the dead in Christ will rise first. Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord. Therefore, comfort one another with these words."
So the lesson for today: Be Prepared. Even though we believe that they day is going to take place, we have no idea when it is going to happen. It could happen today. It could happen tomorrow. It could happen in 300 years. We just don't know. So we need to be prepared for this to happen each day of our life. If there are things that you know you need to take care of, steps you need to take, things you've been putting off, etc... whatever it may be that can hinder you from being fully prepared - take care of it!
As John wrote in Revelation; "... Every eye will see Him..." We have to be prepared for that day.