But ye, brethren, are not in darkness, that that day should overtake you as a thief.
Not in darkness - of understanding (i:e., spiritual ignorance), or of the moral nature (i:e., sin) (Ephesians 4:18; 1 John 2:9).
That, х hina (G2443)] - 'in order that:' with God results are all purposed.
That day - Greek, 'THE day:' the day of the Lord (Hebrews 10:25), in contrast to "darkness."
Overtake - unexpectedly (cf. John 12:35). As a thief. So 'Aleph (') Delta f g, Vulgate. But A B, kleptas for kleptees (G2812). 'As (the daylight overtakes) thieves' (Job 24:17).