Like Elijah, Jeremiah, and the other Prophets, Isaiah was called by God to deliver His messages to Israel for its welfare in the Book of Isaiah. But along with warnings against Israel's sin and rebellious ways came a message of hope in a new depth that would carry on for centuries after Isaiah's passing.
This hope would be embodied through God's Servant known as "Immanuel," who will one day establish a new Israel and God's Kingdom on the earth. Remarkably, Jesus does precisely that in His lifetime, fulfilling over 300 prophecies in Scripture that include intricate details of His death and resurrection foretold in Isaiah chapters 50 through 53.
Throughout the test of time, Isaiah's words have encouraged thousands of people who have suffered the drudgeries in this life while waiting for the Messiah to come in His first and second appearances everyone is counting on.