Jesus established that he came to the earth as a man of flesh and blood only once, telling his eleven faithful apostles: "In a little while the world will see me no more".(John 14:19) And the apostle Paul wrote concerning Jesus Christ: "For Christ did not enter into the holy place made with hands.......but into heaven itself, so that he now appears before God on our behalf. This was not done to offer himself often, as when the high priest enters into the holy place from year to year with blood not his own. Otherwise, he would have to suffer often from the founding of the world. But now he (Jesus) has manifested himself once for all time at the conclusion of the (Jewish) system of things (that ended in 70 C.E.) to do away with sin through the sacrifice of himself ".(Heb 9:24-26)
if Jesus were to take on a fleshly body again, this would invalidate his sacrifice he gave as the Messiah when he was on the earth (from the fall of 29 C.E. to Nisan 14, 33 C.E.). Paul now says that "the Christ was offered once for all time to bear the sins of many; and the second time he appears (or discerned by his genuine disciples) it will be apart from sin, and he will be seen (spiritually or by discernment) by those earnestly looking for him for their salvation".(Heb 9:28)
Just as Jesus installation as king of God's Kingdom in 1914 was not seen by human eyes (Dan 7:13, 14, in which the words "the clouds of heaven" denote invisibility), but was discerned by his genuine disciples, so likewise Jesus "second time he appears" will also be grasped only by his true disciples.
Revelation 1:7 says: "Look ! He is coming with the clouds (denoting being invisible to human eyes), and every eye will see him (or discerned through the cataclysmic events now happening that they are doomed to destruction (see Luke 21:25) or that their salvation is at hand, see Luke 21:28), and those who pierced him (those who are his enemies, symbolically having pierced him); and all the tribes of the earth (or the political nations and their supporters) will beat themselves in grief because of him".
(see Matt 24:30, whereby "all the tribes of the earth will beat themselves in grief, and they will see the Son of man (discerning Jesus as a spirit, not as a human) coming on the clouds of heaven (or invisible, unseen to humans, see also Ex 19:9) with power and great glory" following "the (symbolic) sun (being) darkened, and the moon will not give its light, and the stars will fall from heaven, and the powers of the heavens will be shaken", Matt 24:29, meaning governments and seemingly stable institutions that people have looked to direction and support will fail at this time (compare Isa 34:4), when Armageddon begins (Rev 16:14, 16), causing complete chaos to reign for the world, but rejoicing for Jesus true disciples; see Luke 21:28 and Rev 6:12-17)
