Light is used throughout the Bible as a metaphor for knowledge and understanding. From the first page of the Bible where “God said, Let there be light: and there was light” (Genesis 1:3 KJV) to the last page where “the Lord God giveth them light” (Revelation 22:5 KJV), this figure of speech communicates growing spiritual awareness and perception. In Psalm 119:105, The Bible says, “The word is a lamp unto my feet, and a light unto my path.” (Psalm 119:105 KJV).
Jesus brought the light of the Gospel and its healing power.
And Jesus went about all Galilee, teaching in their synagogues, and preaching the gospel of the kingdom, and healing all manner of sickness and all manner of disease among the people. (Matthew 4:23 KJV)