1 Thessalonians 5:4-8

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. For they that sleep sleep in the night; and they that are drunken are drunken in the night. 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.