Luke 23:44-49 (ESV)
The Death of Jesus
It was now about the sixth hour, and there was darkness over the whole land until the ninth hour, while the sun’s light failed. And the curtain of the temple was torn in two. Then Jesus, calling out with a loud voice, said, “Father, into your hands I commit my spirit!” And having said this he breathed his last. Now when the centurion saw what had taken place, he praised God, saying, “Certainly this man was innocent!” And all the crowds that had assembled for this spectacle, when they saw what had taken place, returned home beating their breasts. And all his acquaintances and the women who had followed him from Galilee stood at a distance watching these things.
In Jesus death, men saw greater light. It was in His death that those who crucified Him could see who He was. God used His death to open eyes. Later the same thing will happen to two other disciples:
Luke 24:30-32 (ESV)
When he was at table with them, he took the bread and blessed and broke it and gave it to them. And their eyes were opened, and they recognized him. And he vanished from their sight. They said to each other, “Did not our hearts burn within us while he talked to us on the road, while he opened to us the Scriptures?”
He would later use the scars of His death to open the eyes of more disciples:
Luke 24:37-43 (ESV)
But they were startled and frightened and thought they saw a spirit. And he said to them, “Why are you troubled, and why do doubts arise in your hearts? See my hands and my feet, that it is I myself. Touch me, and see. For a spirit does not have flesh and bones as you see that I have.” And when he had said this, he showed them his hands and his feet. And while they still disbelieved for joy and were marveling, he said to them, “Have you anything here to eat?” They gave him a piece of broiled fish, and he took it and ate before them.
Mankind can see the light of Jesus when they consider the cross of Jesus.