The Prophet Isaiah holds a scroll facing outward that reads, "Prepare the way of the Lord, make his path straight," which is a quotation from the Old Testament book of Isaiah the prophet. In contemporary language Isaiah is saying: "A voice is calling in the desert: 'Prepare for God's arrival! Make the road straight and smooth, a highway fit for our God!'"
Notice the cloud whirling about the prophet's head and a hand with wings; in the hand of God there are tongs of fire, poised at Isaiah's lips.
Isaiah experienced a vision of God seated on the throne in the heavenly temple. He was immediately convicted of his sinfulness when he saw the Lord Almighty, and was certain he was about to die. But an angel of the Lord flew to him with a live coal in his hand, which he had taken from the altar. He touched Isaiah's lips wit the coal, saying, "This has touched your lips. Your guilt is taken away and your sins are wiped out."
The prophet Isaiah spent his career proclaiming the coming of God's Kingdom and giving many prophecies about the Messiah, the coming Savior.
Jesus described John the Baptist as the one whom Isaiah was talking about, the great herald of the One who was to come: our Lord and Savior Jesus Christ. John traveled around preaching to the crowds to repent and turn away from their evil ways. He told them,"Turn back to worshipping God and prepare for the coming of the Messiah." As a sign of their changed life, John baptized the people in the Jordan river.
The Herron Window was presented in memory of Francis Herron (1774-1860), the third minister of First Presbyterian Church of Pittsburgh, who served from 1811 to 1850.