The Hebrew noun netsach carries a range that includes splendor, enduring strength, constancy, and duration expressed adverbially as continually or forever. David ascribes splendor to the Lord, Samuel calls God the Glory or Enduring One of Israel, Abner asks whether fratricidal violence must continue, Amos condemns Edom's sustained fury, Isaiah promises death swallowed forever and also denies that God will accuse without end, Jeremiah laments unending pain, and other laments ask whether divine hiding will last forever.
The same lexeme can therefore magnify God's majesty, describe persistence, or press the anguished question of how long. Responsible teaching reads the noun with its predicate, speaker, genre, and covenant setting rather than importing every sense into every verse. It must not use an English forever to erase rhetorical questions, promise endless human rage, shame prolonged suffering, set a timeline by word study alone, or silence lament with a quick appeal to future victory.