And everyone who has this hope in Him purifies himself, just as He is pure."
1 John 3:2-3 (NKJV)
What if you knew that someone famous, some kind of celebrity, or someone well-known was going to come to your home, what would you do? Most people would make sure that everything in their home was cleaned, straightened up, and that nothing was out of place. The fact that someone special was coming to see you would most likely cause you to change what you were doing, and alter any other plans you may have already had, so that you would be ready for that special day.
While there are disagreements among Christians as to when and how Jesus will return to the earth, one thing that is certain is that Jesus will come again. But even if some Christian was to go as far as saying that they did not think Jesus would ever return, no one lives forever and one day we will all meet Jesus. Knowing this should make a difference in our life. If we really have an expectation that we will meet Jesus one day, it will have an impact in our life and influence the way we live.
John said that if we have a "hope", an expectation, that one day we will see Jesus, that this expectation would help to purify us. In the same way that someone expecting a visit from another person would be influenced by that expected visit, our expecting to see Jesus one day should make a difference in our lives. Knowing that one day we will meet Jesus should cause us to focus on what is really important in our life concerning doing God's will, and eliminate things in our life that might hinder us from serving God. If we knew that we would meet Jesus tomorrow, how would we be living our life today?