John 8:26
I have many things to say and to judge of you: but he that sent me is true; and I speak to the world those things which I have heard of him. I have many things to say and to judge of you: but he that sent me is true; and I speak to the world those things which I have heard of him.
Jesus spoke these words in the temple during His discourse at the Feast of Tabernacles, when the lamps lighting the court recalled the pillar of light that had guided Israel and pointed forward to the Messiah. In that setting He declared Himself to be the light of the world, meaning that He Himself is the source of spiritual light who illuminates the world, of which the temple lamps were only an imperfect symbol. When His hearers challenged Him about who He was, He did not make the explicit claim His opponents sought, but affirmed His divine commission. The statement means that He had many things to say and to judge concerning His hearers, yet He spoke to the world only what He had heard from the Father who sent Him, whose word is true.
Those He had to judge were the Pharisees as the people made the depositaries of sacred trust, even the living oracles of God in the Old Testament Scriptures, and the same judgment applies to religious teachers today who know neither Christ nor His Father. The verse means that Christ was sent from heaven by the true Father to bring a true message to the world, including the gift of eternal life to all who receive it. What Christ thus speaks to the world gives lessons containing the true science of education. His words carry profound meaning because He spoke with the cross before Him, and delivering this message cost Him His life.