The Ramchal: What Will Happen During the Geula

(Edited)

In the days of Moshiach, there will be a great judgement of the nations of the world.

Those that the Divine judgment will determine are gulity, will be punished.

Those that remain, will recognize the Truth, and abandon false gods.

They will follow the Torah; as they will realize, that through this service, they will be able to receive from the Holiness and Light of Hashem.
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The whole world will be drawn after service of the Creator, and there will be no idolatrous practices.

This is what the Navi referred to when he said (Tzephaniah 3:9), "Then I will turn over the nations, to one clear language;"

As well as the verse (Zechariah 14:9), "On that day, Hashem will be One, and His name will be one."