1 Thessalonians 5:6, 8

So then let us not sleep [in spiritual indifference] as the rest [of the world does], but let us keep wide awake [alert and cautious] and let us be sober [self-controlled, calm, and wise].

But since we [believers] belong to the day, let us be sober, having put on the breastplate of faith and love, and as a helmet, the hope and confident assurance of salvation.