Solving Approach
At this length, the average word here runs about 3.8 letters. With plenty of short words in the mix, start by isolating any single-letter or two-letter groups — those are almost always "A," "I," "TO," "OF," or "IS." This is rated hard — the substitution pattern is less forgiving, so patience with frequency analysis pays off.
About Isaiah
Isaiah was a Hebrew prophet who lived in Jerusalem during the eighth century BCE, active during the reigns of several Judean kings including Uzziah, Jotham, Ahaz, and Hezekiah. The book bearing his name is one of the longest in the Hebrew Bible and contains poetry, prophecy, and prose addressing political crises of his era, including the Assyrian threat to Judah. Scholars widely regard Isaiah as among the most literarily sophisticated voices in ancient Near Eastern writing, and his texts have been extensively quoted and referenced throughout subsequent Jewish and Christian traditions.
Did you know? The Dead Sea Scrolls, discovered in 1947, include a complete scroll of Isaiah dating to approximately 125 BCE, making it one of the oldest known manuscripts of any biblical book.