John 8:18

I am one that bear witness of myself, and the Father that sent me beareth witness of me.

Jesus spoke these words in the court of the temple specially connected with the services of the Feast of Tabernacles, in the morning after the evening lighting of the great temple lamps. That lighting illuminated Jerusalem and flooded it with light in commemoration of the pillar of light that guided Israel in the desert and in hope of the Messiah's coming to shed His light upon Israel. It was when the sun had just risen above the Mount of Olives and its rays fell with dazzling brightness on the marble palaces and lighted up the gold of the temple walls.

The saying belongs to the same discourse in which He declared Himself the light of the world. By it He presented Himself as the source of spiritual light illumining the darkness of the world, more truly represented by the sun His own hand had set in the heavens than by the temple lamps. Whoever follows Him will not walk in darkness but will have the light of life.