Listen to verse 1: “the vision concerning Judah and Jerusalem that Isaiah son of Amos saw during the reigns of Uzziah, Jotham, Ahaz and Hezekiah, kings of Judah.”  To understand the majority of what is said in this prophecy it would be good to understand the historical setting in which Isaiah lived and ministered.  You’ll find that period described in 2 Chronicles, chapters 26-33.  I’d suggest you go back and read those chapters so you’ll understand the conditions Isaiah addressed in Judah and Jerusalem, and surrounding countries.  You’ll find he ministered to the Southern Kingdom while the Northern Kingdom, Israel, was being destroyed by the Assyrians. 

Isaiah was eloquent in his message.  In fact, he spoke with an evangelistic appeal, calling people to trust in the coming Messiah God would send to bring salvation, victory and provision for the people.  Isaiah was martyred for delivering that message, possibly the one referred to in Hebrews 11:37, one who was “sawn asunder,” giving his life because he represented God faithfully to a nation that was rebelling and turning away from the living God. 

It took courage for Isaiah to fulfill his mission.  Likewise, it’ll take courage for you to faithfully serve God.