'At that time the sign of the Son of Man will appear in the sky, and all the nations of the earth will mourn. They will see the Son of man coming on the clouds  of the sky with power and great glory.' Matt. 24:30'

' ..for you know very well that the day of the Lord will come like a thief in the night. .. But you, brothers and sisters, are not in darkness, so that this day should surprise you like a thief. You are all the sons and daughters of light and of the day. We do not belong to the darkness.. So then let us be alert and self-controlled. 1 Thess. 5: 2,4-6