Great disbelief will spread throughout the world.
Fortunate is the person who will strengthen himself with faith in those times.
This warning will not help.
There were others, such as Daniel, who foretold that before the coming of the Messiah, many will be tested and refined, that the evil will worsen while the wise will keep their understanding.
Many will have their faith tested. The person who will pass the test and retain his faith will be fortunate and will attain all the good that is destined to come (may it be soon and in our days) about which the prophets and wise men prophesied.
If so, everyone should take care to remain strong in his faith. Since this prediction is already common knowledge, there will be no test.
But it will still be a great test.
Many will do evil. "The wicked will act wickedly" [Daniel 12:10]
I am telling you this for the sake of those few good people who will be strong in their faith. They will have great internal battles. But my words will console and strengthen them, for they will see that someone already predicted this. - Rabbi Nachman of Breslov