5 And he was given a mouth speaking great things and blasphemies, and he was given authority to continue for forty-two months.

Here, that the apostle John gives us good news. This world dictator will only govern for 42 months, that is, for three and a half years. When John wrote that: "He was also given a mouth that spoke great things and blasphemy," he is indicating that this character will be a great talker, someone who will fill his mouth promising many things, a charlatan. The prophet Daniel also mentions this characteristic.
We need to check everything we hear in our time.

The Antichrist will be a charlatan, will have much charisma, will be able to promote himself, to obtain the favor of this world that rejects Jesus Christ.