Passage
For all you are the children of light and children of the day: we are not of the night nor of darkness.
For all you are the children of light and children of the day: we are not of the night nor of darkness.
1 Thessalonians 5:3 For when they shall say: Peace and security; then shall sudden destruction come upon them, as the pains upon her that is with child, and they shall not escape.
1 Thessalonians 5:4 But you, brethren, are not in darkness, that the day should overtake you as a thief.
1 Thessalonians 5:5 For all you are the children of light and children of the day: we are not of the night nor of darkness.
1 Thessalonians 5:6 Therefore, let us not sleep, as others do: but let us watch, and be sober.
1 Thessalonians 5:7 For they that sleep, sleep in the night; and they that are drunk, are drunk in the night.
The verse centers on "light", "darkness", "children", and "night". It is saying that the contrast between light and darkness marks a real divide in how people respond to God's work.
The nearby context moves from verse 4's "But you brethren are not in darkness..." into verse 6's "Therefore let us not sleep as others...", so "light" and "darkness" 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 "light" and "darkness" with trust shaped by these words, not by a vague optimism outside the passage.