Light Has Come

According to this passage, why did God send His Son into the world?

Approximately 700 years before it came to pass, the prophet Isaiah declared: “The people who walked in darkness have seen a great light; those who dwelt in a land of deep darkness, on them a light has shone” (Isaiah 9:2) The people walking in darkness are sinners, people who stumble around in the dark, living for themselves, doing as they please, and loving the darkness because it hides their sin. These are the people the light shines on. And if we are honest, that is you and me before we knew Jesus. Darkness loving people. Sinners.