How God's Voice at Sinai Circled the World From Every Direction

This is what Scripture says (Job 37:5): "God thunders marvelously with His voice, [He does great things which we cannot comprehend]." What is the meaning of "thunders"? It is simply that, at the hour when the Holy One, blessed be He, gave the Torah at Sinai, the Holy One, blessed be He, showed Israel wonder upon wonder through His voice. How? The Holy One, blessed be He, would speak, and the voice would go out and circle round through all the world. And Israel would hear the voice: it came to them from the south, and they would run [southward] to receive the voice from there; and so it was to the four directions. And afterward it turned for them from the heavens, and they would lift their eyes to the heavens; and the voice would turn for them from the earth. From where? As it is said (Deuteronomy 4:36): "From the heavens He made you hear His voice, to discipline you, and upon the earth He showed you His great fire, [and His words you heard from the midst of the fire]."