Isaiah 1:1. “The vision of Isaiah the son of Amoz, which he saw concerning Judah and Jerusalem in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah.”
What is a vision in this context? To reduce it to an hallucination is to deny that it was from God. It was far more than that. It was a revelation from God. It was not to be taken lightly, and the Jewish people were accustomed to their prophets relating vision they’d had from God. The scriptures were not yet complete, Messiah had not come, and so God spoke to His people through His prophets. Usually, prophets were held in high regard–at least, until they said things the people and/or the rulers did not want to hear.
To be a prophet was to be in a high-risk occupation, and it wasn’t a job people sought for if they wanted to become wealthy. If fact, the prophet didn’t choose his job. God chose the prophet. He did so with purpose, and He enable the prophets to accomplish the work He had given them to do.
Isaiah’s work was particularly notable for the length of his tenure us a prophet, and for the strong Messianic content of much of his prophesies. He also prophesied about the Millenial Kingdom, and when we get to those chapters, we’ll need to make sure we understand the importance of the difference between heaven and the Millenial reign.