The parousia will be
unmistakable because it will be
accompanied by unprecedented
signs.
Matthew 24:27
For just as lightning comes from the east and is seen
as far as the west, so will the coming of the Son of Man
be.
Some signs are general events
concerning the evangelization
of the world.
Matthew 24:14
And this gospel of the kingdom will be preached
throughout the world as a witness to all nations, and
then the end will come.