Biblion Bible Commentary
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The Light of the World
John 8:12-20
12 Again, therefore, Jesus spoke to them, saying, “I am the light of the world. He who follows me will not walk in the darkness, but will have the light of life.” · WEB
He claims to be the light under the great lamps of the feast, and the argument turns to the law of witnesses.
Again, therefore, Jesus spoke to them, saying, "I am the light of the world" John 8:12.
The setting is still Tabernacles, and it supplies the picture as the water-drawing supplied the last one. In the court of the women, where the treasury stood John 8:20, four enormous lampstands were lit during the feast, and the light from them was said to reach every courtyard in the city. Men danced with torches through the night.
Under those lamps he says this — and the claim is not a light for Israel but of the world, which is the reach the prologue set out John 1:9.
The feast also remembered the wilderness, where a pillar of fire went in front of the camp and was the only thing anyone had to follow in the dark Exodus 13:21. That is exactly the promise attached: "He who follows me will not walk in the darkness, but will have the light of life."
The verb is follows. Light is not offered as an object to be admired or a doctrine to be held; the benefit belongs to somebody walking behind it, which is what a pillar of fire is for.
The Pharisees therefore said to him, "You testify about yourself. Your testimony is not valid" John 8:13.
The objection is legally correct and he had conceded the same rule himself three chapters earlier John 5:31. A man's uncorroborated claim about himself proved nothing.
"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" John 8:14.
The answer is that the rule assumes a witness who could be mistaken. Here the disputed fact is his origin, and he is the only person present with access to it. A rule designed to protect against unverifiable claims cannot settle a case where one party has the information and the other does not.
"You judge according to the flesh. I judge no one" John 8:15. According to the flesh is judging by appearances, which the last chapter warned about John 7:24.
"It's also written in your law that the testimony of two people is valid. I am one who testifies about myself, and the Father who sent me testifies about me" John 8:17–18.
He then satisfies the rule on its own terms. Two witnesses are produced — and your law is a cool phrase from a man being examined under it.
"Where is your Father?" Jesus answered, "You know neither me nor my Father. If you knew me, you would know my Father also" John 8:19.
Their question is meant as a challenge: produce him. The reply says the two cannot be separated, which is this Gospel's settled position John 14:9, and it is the second time in two chapters they are told they do not know God.
Jesus spoke these words in the treasury, as he taught in the temple. Yet no one arrested him, because his hour had not yet come John 8:20.
The writer locates it precisely — the treasury, in the court where the lamps were — and repeats his standing explanation. The claim just made was blasphemy if untrue and they did nothing, and the reason given is not fear of the crowd but a clock.
settled What this mark means