Passage
But ye, brethren, are not in darkness, that that day should overtake you as a thief.
But ye, brethren, are not in darkness, that that day should overtake you as a thief.
1 Thessalonians 5:2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
1 Thessalonians 5:3 For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.
1 Thessalonians 5:4 But ye, brethren, are not in darkness, that that day should overtake you as a thief.
1 Thessalonians 5:5 Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.
1 Thessalonians 5:6 Therefore let us not sleep, as do others; but let us watch and be sober.
The verse centers on "darkness", "brethren", "should", "overtake", and "thief". It is saying that the verse draws attention to "darkness" and "brethren", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 3's "For when they shall say Peace and..." into verse 5's "Ye are all the children of light...", so "darkness" and "brethren" belong inside that flow. In 1 Thessalonians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "darkness" and "brethren" with trust shaped by these words, not by a vague optimism outside the passage.