In Matthew 5:14, the light of the world signifies the truth of the church. (Apocalypse Explained 405[2])

In John 8:12, this signifies the light proceeding from the Lord, which is life itself, and which enlightens not only the understanding, but also enlivens it according to how it is received. (Apocalypse Explained 349[10])

In John 11:9, this signifies truth from good. (Arcana Coelestia 2353)