How do we know that the prophecies of Isaiah are true?

The prophecies of Isaiah regarding the sufferings of Christ are validated by their fulfillment in the New Testament. For instance, Isaiah's foretelling of a suffering servant who would bear the sins of many finds its culmination in the person of Jesus. Throughout the gospels, we see Christ fulfilling these prophecies, as chronicled by the apostles who recognized His suffering and glory as foretold. Additionally, the reverent acknowledgment by both Jesus and the apostles of Isaiah's writings as divine revelation supports their truth. This confluence of prophecy and fulfillment only strengthens the certainty of God's Word.