1 Thessalonians 5:2, 4-6

You know very well that the day the Lord comes again will be a surprise, like a thief that comes in the night.

But you, brothers and sisters, are not living in darkness, and so that day will not surprise you like a thief. You are all people who belong to the light and to the day. We do not belong to the night or to darkness. So we should not be like other people who are sleeping, but we should be alert and have self-control.