You strain to comprehend how a man living in the darkness of his unregenerate soul can come to believe in the living God through the gospel. LIGHT! It takes the light of the glorious gospel through preaching to penetrate the soul and reach into the man's sin darkened heart. There in the heart is where sinful man can reject that light or believe it. In the heart is where an unjustified man believes unto the righteousness of God by faith. The light that comes from the word of the gospel is what brings conviction of sin and faith into that darkened heart so that man can believe and be justified and washed clean from all sin by the blood of the Lamb. This is the gospel we have been given as a ministry of mercy and reconciliation to preach in all the world to seek out and save the lost.