1 Thessalonians 5:4-6, 8

But ye, brethren, are not in darkness, that that day should overtake you as a thief: for ye are all sons of light, and sons of the day: we are not of the night, nor of darkness; so then let us not sleep, as do the rest, but let us watch and be sober.

But let us, since we are of the day, be sober, putting on the breastplate of faith and love; and for a helmet, the hope of salvation.