12 Again, therefore, Jesus spoke to them, saying, “I am the light of the world. [1] He who follows me will not walk in the darkness, but will have the light of life.” 13 The Pharisees therefore said to him, “You testify about yourself. Your testimony is not valid.” 14 Jesus answered them, “Even if I testify about myself, my testimony is true, for I know where I came from, and where I am going; but you don’t know where I came from, or where I am going. 15 You judge according to the flesh. I judge no one. 16 Even if I do judge, my judgment is true, for I am not alone, but I am with the Father who sent me.
Matthew Henry's Commentary on John 8:12-16
Commentary on John 8:12-16
(Read John 8:12-16)
Christ is the Light of the world. God is light, and Christ is the image of the invisible God. One sun enlightens the whole world; so does one Christ, and there needs no more. What a dark dungeon would the world be without the sun! So would it be without Jesus, by whom light came into the world. Those who follow Christ shall not walk in darkness. They shall not be left without the truths which are necessary to keep them from destroying error, and the directions in the way of duty, necessary to keep them from condemning sin.