Daniel's vision in the third year of King Belshazzar's reign reveals significant events concerning the Persian and Grecian empires, presented in Hebrew to emphasize its importance for the Jewish people. The vision, experienced while Daniel was awake, serves to confirm earlier revelations and highlights the impending fall of prominent kingdoms including Babylon. The scene is set in Susa, indicating the connectivity of Daniel's prophetic messages to the broader context of empires affecting Israel and the Church.