I believe Christ could return tomorrow and everyone will know it.
"For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be." (Matt. 24:27)
"When the Son of Man comes in His glory, and all the holy angels with Him, then He will sit on the throne of His glory. All the nations will be gathered before Him, and He will separate them one from another, as a shepherd divides his sheep from the goats. And He will set the sheep on His right hand, but the goats on the left." (Matt. 25:31-33)
The point of my post was you may have salvation, but not leave here in the Rapture. Many seem to think they can be saved and never bear fruit afterward and be "entitled" to escape the Tribulation. The purpose of the parables was to warn Christians that they must bear fruit. Works doesn't save you, but it is a result of your feelings for your Lord. Salvation is completely separate from being Raptured out of the Tribulation. Works don't save you as shown when the thief on the cross wasn't able to DO anything after he announced his faith that Christ was Lord. He went to heaven with Christ that day even though his sentence was just and he did no works. The moment you accept Christ as Lord and repent of your sins, you become "justified". You have done nothing, but you are still going to heaven. If you don't die immediately, then you are supposed to be "sanctified". That is what the apostles were doing after the Ascension of Christ. Paul lamented that his flesh did things his spirit knew were wrong and there was a battle going on his whole life. Even though he still sinned, he was being sanctified as he followed Jesus. Then when you die, you are "glorified", and become as Christ is.
I believe we are to STRIVE to remove the sinful parts of our character every day, even though we are ASSURED of salvation. Those that don't are in jeopardy to pay for their sins in this world. That is the answer for some that ask why "good" people suffer in this world. We are not assured that we won't suffer. In fact, Christ said persecution and suffering was a given if you follow Him.
If you "slumber" and are a slacker for Christ during the time you have been commanded to spread the Gospel and live for Him, why would He relieve you of the punishment of the world in the Tribulation?( read the parable of the talents) The weeping and gnashing of teeth will be WITH the unbelievers. In other words, Christians will suffer along side of the lost. God has made an investment in you and we are not supposed to bury it till he comes back. The Rapture isn't the second coming of Christ.