The great tribulation corresponds with the time of the seven last plagues of Revelation chapter 16 “And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up the wrath of God” (Revelation 15:1).
God’s wrath will be directed against the ones who disobey His law and oppress His people “For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness” (Romans 1:18).
The great tribulation also corresponds with the Battle of Armageddon. Both take place immediately before Christ’s second coming “And he gathered them together into a place called in the Hebrew tongue Armageddon. And the seventh angel poured out his vial into the air; and there came a great voice out of the temple of heaven, from the throne, saying, It is done” (Revelation 16:16,17).
The great tribulation and the time of trouble will last for a short period: Revelation 18:8 tells us, “Therefore shall her plagues come in one day.” A “day” in Bible prophecy represents one literal year (Ezekiel 4:6, Numbers 14:34, Luke 13:32). So, when Revelation says that “her plagues come in one day,” it means within, or less than, one year’s time.
The very nature of the seven last plagues-the rivers and seas turning to blood and the planet being scorched with great heat-would make it impossible for the human race to survive more than few months. This is why Jesus said, “And unless those days were shortened, no flesh would be saved; but for the elect’s sake those days will be shortened” (Matthew 24:22,).
The great tribulation will prove to the universe that nothing would change the characters of the faithful. God’s people will still trust Him during the most difficult circumstances. And God’s enemies will rebel against Him no matter what “He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still” (Revelation 22:11).
God will give the ultimate victory to His saints. The Bible describes the 144,000 as “they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb” (Revelation 7:14).
In His service,