Then spoke Jesus again unto them, saying,
I am the light of the world: he that follows me shall not walk in darkness, but shall have the light of life.
All Commentaries on John 8:12 Go To John 8
Theophilus of Antioch
AD 184
You may bring these words against Nestorius: for our Lord does not say, In Me is the light of the world, but, I am the Light of the world: He who appeared man, was both the Son of God, and the Light of the world; not, as Nestorius fondly holds, the Son of God dwelling in a mere man.