God calls us out of spiritual darkness into the light of Christ. When we see the light, it comes quickly to dispel darkness. The change is sudden and abrupt. Darkness is defeated immediately in the presence of light. That's how God calls us out of spiritual darkness. God called you out of darkness into His marvelous light (1 Peter 2:9). Jesus Christ is the light.
God calls us effectively, when our eyes of understanding are opened to the truth 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). We are called by God to see the light, that we may know the truth of God in Jesus Christ (John 8:31). He is the light of life. Salvation comes through the gospel, calling us out of spiritual darkness into the light of Christ.
God calls us to freedom from spiritual darkness. It is not our achievement. Rather, the light comes to us from without, changing our hearts within. Light is Jesus Christ coming into our dark hearts. Then you may testify, "I saw the light." Give all the glory to Him who called you out of darkness into His marvelous light.
God calls us to walk in the light. When we see the light of truth, then we are able to walk in the light. 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). God calls us out of darkness, to walk in the light of Jesus Christ our Lord.