In Matt. 24:37-39 Jesus gives a strong proof of the fact that mankind would not physically see Him in His Second Advent: "As were the days of Noah, so shall be the coming [Greek, parousia, presence, margin] of the Son of man. For as in those days which were before the flood they were eating and drinking, marrying and giving in marriage … and they knew not until the flood came, and took them all away; so shall be the coming [Greek, parousia, presence, margin] of the Son of man" (ASV). In this passage Jesus shows that the people in their acts and in their ignorance of the impending trouble just before the flood and during His own Second Presence just before the Great Tribulation would be alike.
As in the days of Noah before the flood, the people were engaged in the ordinary activities of social life, but because of unbelief in the preaching of a coming flood were ignorant of its impendency, so during Christ's Second Presence just before the Great Tribulation would burst upon the world, the people would engage in the ordinary activities of social life, entirely ignorant of the coming tribulation because disbelieving the testimony respecting it and its cause, Christ's Second Presence. That among other things in these verses the time of Noah's presence before the flood is compared with the time of Christ's Second Presence before the Great Tribulation, is manifest also from Luke 17:26:
"And as it was in the days of Noah, so shall it be also in the days of the Son of man." Here the expression "in the days of the Son of man," a certain period of His Second Advent, is used as the parallel of the expression "the presence of the Son of man" in Matt. 24:37, which proves that the passage compares the periods to which it refers. See also Luke 17:28-30. How, we ask, can it be that Jesus could be present and yet the people in general would be ignorant of this fact, as well as of the Time of Trouble coming? If they would be able physically to see Him, of course they would know of His Presence and would expect the trouble to follow. The fact of their ignorance of His Presence necessarily implies that He would be hidden from their physical eyes, and so His Return must be invisible to their physical eyes.
As in the days of Noah before the flood, the people were engaged in the ordinary activities of social life, but because of unbelief in the preaching of a coming flood were ignorant of its impendency, so during Christ's Second Presence just before the Great Tribulation would burst upon the world, the people would engage in the ordinary activities of social life, entirely ignorant of the coming tribulation because disbelieving the testimony respecting it and its cause, Christ's Second Presence. That among other things in these verses the time of Noah's presence before the flood is compared with the time of Christ's Second Presence before the Great Tribulation, is manifest also from Luke 17:26:
"And as it was in the days of Noah, so shall it be also in the days of the Son of man." Here the expression "in the days of the Son of man," a certain period of His Second Advent, is used as the parallel of the expression "the presence of the Son of man" in Matt. 24:37, which proves that the passage compares the periods to which it refers. See also Luke 17:28-30. How, we ask, can it be that Jesus could be present and yet the people in general would be ignorant of this fact, as well as of the Time of Trouble coming? If they would be able physically to see Him, of course they would know of His Presence and would expect the trouble to follow. The fact of their ignorance of His Presence necessarily implies that He would be hidden from their physical eyes, and so His Return must be invisible to their physical eyes.