Passage
You will not be afraid of terror by night, Or arrow that flies by day;
You will not be afraid of terror by night, Or arrow that flies by day;
Psalms 91:3 For it is He who delivers you from the snare of the trapper And from the destructive pestilence.
Psalms 91:4 He will cover you with His pinions, And under His wings you will take refuge; His truth is a large shield and bulwark.
Psalms 91:5 You will not be afraid of terror by night, Or arrow that flies by day;
Psalms 91:6 Of pestilence that moves in darkness, Or of destruction that devastates at noon.
Psalms 91:7 A thousand may fall at your side And ten thousand at your right hand, But it shall not approach you.
The verse centers on "afraid", "terror", "night", "arrow", and "flies". It is saying that the verse draws attention to "afraid" and "terror", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 4's "He will cover you with His pinions..." into verse 6's "Of pestilence that moves in darkness Or...", so "afraid" and "terror" belong inside that flow. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "afraid" and "terror" with trust shaped by these words, not by a vague optimism outside the passage.