This answer was from the first taken for granted by each "chosen people," and especially by the Hebrews: throughout their whole history, whether the Almighty talks with Adam in the Garden or writes the commandments on Mount Sinai, he uses the same language--the Hebrew.
The answer to the third of these questions, that regarding the diversity of languages, was much more difficult.

Naturally, explanations of this diversity frequently gave rise to legends somewhat complicated.
The "law of wills and causes," formulated by Comte, was exemplified here as in so many other cases.

That law is, that, when men do not know the natural causes of things, they simply attribute them to wills like their own; thus they obtain a theory which provisionally takes the place of science, and this theory forms a basis for theology.
Examples of this recur to any thinking reader of history.

Before the simpler laws of astronomy were known, the sun was supposed to be trundled out into the heavens every day and the stars hung up in the firmament every night by the right hand of the Almighty.

Before the laws of comets were known, they were thought to be missiles hurled by an angry God at a wicked world.