1 Thessalonians 5:4-6 “But ye, brethren, are not in darkness, that that day should overtake you as a thief. Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness. Therefore let us not sleep, as [do] others; but let us watch and be sober.”

In the Bible, there are several verses referring to “the day of Lord so cometh as a thief in the night” (1Ts 5:2)(2Pe 3:10) and “I will come on thee as a thief, and thou shalt not know what hour I will come upon thee.” (Rev 3:3)(Rev 16:15) The Lord also said “But of that day and hour knoweth no [man,] no, not the angels of heaven, but my Father only.” (Mat 24:36)(Mak 13:32)(Act 1:7).

Dear Brothers and Sisters, according to Bible, do we know when is the day of Lord? Indeed the answer is already in the verses we read: if we are still “children of darkness”, and still live in the night (in the flesh), then to us the day of Lord will come as a thief, “For they that sleep sleep in the night; and they that be drunken are drunken in the night.” (1Ts 5:7) how would the slept and drunken “children of darkness” in the night know when the Lord has arrived? To them, wouldn't that the day of Lord come as a thief in the night? Therefore, the Lord said to the “dead” church of Sardis (Rev 3:1) “If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee.” (Rev 3:3) “ If therefore thou shalt not watch” means: Church of Sardis, if you still sleep (not repent), and continoue to be “children of darkness” slept and drunken in the night, I (the Lord) will come and judge you, and when I come, you will not know, to you I come like a thief entering a slept drunk's house in the night!

On the contrary, if we are “children of light”, and live in the day (in the Spirit), and watch and sober, love one another, then when our Lord returns and knocks the door, we will open for him immediately (Luk 12:36)(Rev 3:20), our Lord will say to us: “Blessed [are] those servants, whom the lord when he cometh shall find watching: verily I say unto you, that he shall gird himself, and make them to sit down to meat, and will come forth and serve them.” (Luk 12:37)

Dear Brothers and Sisters, now we shall know: “the day of the Lord will come as a thief in the night;” (2Pe 3:10) speaks to whom? To those who are “children of light”? Or to those who are “children of darkness”?

Dear Brothers and Sisters, if we are still “in darkness” (1Jn 2:11), we may call upon the name of whom “ hath called you out of darkness into his marvellous light:” Jesus Christ our saviour. He is willing and able to save us and wake us up to escape the wrath of God.