You're not the only one who might not be here tomorrow. Your spouse might not be here. Your parents, siblings, children, and/or grandchildren may not be here tomorrow either. There may not be a "here" tomorrow. There will be a day when everything around us is burned up and a new heaven and a new earth are restored. Your house, your car, your computer, your smartphone and any other possessions you have amassed in your lifetime are only good for one thing: kindling.
Now concerning how and when all this will happen, dear brothers and sisters, we don't really need to write you. For you know quite well that the day of the Lord's return will come unexpectedly, like a thief in the night. When people are saying, "Everything is peaceful and secure," then disaster will fall on them as suddenly as a pregnant woman's labor pains begin. And there will be no escape. (1 Thessalonians 5:1-3 NLT)
The idea of an "end of the world" may not sound very good to you, but it's true. We just don't know when it will happen. It could happen...now.
But you aren't in the dark about these things, dear brothers and sisters, and you won't be surprised when the day of the Lord comes like a thief. For you are all children of the light and of the day; we don't belong to darkness and night. (1 Thessalonians 5:4-5 NLT)
Well...we're still here. The moment of His return hasn't happened yet. But the moment will come. So, how will you live in light of the fact that there may not be a tomorrow here in this life?
So be on your guard, not asleep like the others. Stay alert and be clearheaded. Night is the time when people sleep and drinkers get drunk. But let us who live in the light be clearheaded, protected by the armor of faith and love, and wearing as our helmet the confidence of our salvation. For God chose to save us through our Lord Jesus Christ, not to pour out His anger on us. Christ died for us so that, whether we are dead or alive when He returns, we can live with Him forever. So encourage each other and build each other up, just as you are already doing. (1 Thessalonians 5:6-11 NLT)