Adrian Rogers explains: “Spiritual blindness makes beggars of us all. ... The blind need more than light in order to see. ... I used to think, as a young preacher, that what you had to do to get people saved is just to tell them how to be saved. Just turn on the light. But it doesn’t matter how much light there is, or the person is blind because he cannot see it. It takes more than light, it takes sight. And a person who is blind cannot see the light, no matter how strong the light is or how pure the light is. It takes more than preaching to get people saved. That’s the reason I frequently say to you, I can preach truth, but only the Holy Spirit can impart truth. That is the reason why we must be a praying church. That’s the reason you must be a spirit filled soul winner. That is the reason that we must have the anointing, because we are dependent upon God to open blinded eyes to the Gospel of Jesus Christ. It takes more than light, it takes takes sight. We need to understand that nobody can be argued into the kingdom of heaven. Nobody can be educated into the kingdom of heaven. I’m not against letting the light shine. You must let the let shine. You must preach. But remember, there is another dimension.” (Jesus is God’s Answer to Man’s Darkness: John 20:30, emphasis mine)
Fallen man is spiritually blind, and therefore he needs sight. No one seeks God, so God must seek man, and Jesus does this very thing when He seeks (Luke 19:10), draws (John 12:32) and knocks upon the heart's door of the lost. (Revelation 3:20) Meanwhile, the Holy Spirit convicts the heart (John 16:8), pricks the heart (Acts 26:14), pierces the heart (Acts 2:37) and even opens the heart to respond to the Gospel. (Acts 16:14) This is Illumination of Prevenient Grace, but that is not to be confused with Regeneration. Illumination deals with the old heart. Regeneration deals with the new heart. John 1:9 states: “There was the true Light which, coming into the world, enlightens every man.” The Gospel is the Light through which the Holy Spirit gives Sight. (Romans 10:17) A man is illuminated in order to receive the Gospel. A man is regenerated after he has been sealed in Christ. (Ephesians 1:13) Regeneration is when we are washed and renewed by the Holy Spirit (Titus 3:5), in having become a "new creature" in Christ (2nd Corinthians 5:17), born again with a "new heart" and a "new spirit." (Ezekiel 36:26) Calvinism, in contrast, overrides Ephesians 1:13 by erroneously teaching that men are preemptively placed in Christ in order to gain access to the "new heart" in regeneration, in order that the decision of the elect be made irresistible, as in Irresistible Grace. Hence, you have the clear difference between the Prevenient Grace of Arminianism and the Irresistible Grace of Calvinism.