He is intangible and invisible. But His work is more powerful than the most ferocious wind. The Spirit brings order out of chaos and beauty out of ugliness. He can transform a sin-blistered man into a paragon of virtue. The Spirit changes people. The Author of life is also the Transformer of life.
R. C. SproulFallen man is free to choose what he desires, but because his desires are only wicked he lacks the moral ability to come to Christ. As long as he remains in the flesh, unregenerate, he will never choose Christ. He cannot choose Christ precisely because he cannot act against his own will. His fall is so great that only the effectual grace of God working in his heart can bring him to faith.
R. C. Sproul