God opens our eyes of understanding, when we see the truth. It comes quickly to dispel darkness, through the light of Christ. The change is sudden and abrupt. Darkness is defeated immediately in the presence of light. That's the way God's Son changes people who have lived in spiritual darkness. Christ is the light of truth, taking away the darkness of unbelief.
The Holy Spirit opens our eyes of understanding to see the truth of Christ. We see the light by new birth, through faith in the Lord Jesus Christ. It is not our achievement. Rather, light comes to us from without, changing us from within. There was darkness, then there is light. That's God's work in us, "the eyes of our understanding being enlightened" (Ephesians 1:18).
Jesus said, "I am the light of the world. He who follows me shall not walk in darkness, but have the light of life" (John 8:12). The light of Christ comes to us by the grace of God through the Holy Spirit. We see Christ dying for our sins. We see Christ as our living Lord (Romans 10:9).
"If we walk in the light as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanses us from all sin"(1 John 1:7). Our eyes of understanding are open to see the light of Christ as the way, the truth and the life (John 14:6). We see ourselves cleansed from all sin to walk in the light of Christ.
