The Holy Spirit opens your eyes of understanding to the truth of Christ. It comes quickly to dispel darkness, through the light of Christ. Light comes to us suddenly. Darkness is defeated immediately in the presence of light. That's the way God's Son changes people who have lived in spiritual darkness. You see the truth of Christ, taking away the darkness of unbelief.
The Holy Spirit opens your eyes of understanding to see the light of Christ. You see the light through new birth, unto 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. The Holy Spirit opens the eyes of our understanding being enlightened (Ephesians 1:18).
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). The Holy Spirit opens your eyes of understanding to see Christ as the way, the truth and the life (John 14:6). You see yourself cleansed from all sin to walk in the light of Christ.
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 Holy Spirit enables you to walk in the light of Christ, by the grace of God. You see Christ dying for your sins. You see Christ as your living Lord (Romans 10:9).