No two things in the world are any different than law and grace. They are as opposite as light and darkness. They can no more agree than fire and water (Rom. 11:5-6). What is so amazing is that, while law and grace are so diametrically opposed, the human mind is so void of spiritual understanding and turned away from God that the most difficult thing for a human to do is to discriminate between the two. Men insist on mixing what God has positively put asunder.
The man who knows the place of the law and the glory of God's free grace, who can rest in Christ alone for all that the law requires and justice demands, knows the gospel.
The first real difficulty in conversion is to get a man LOST–truly lost! A lost sinner is hard to find. There are plenty of weak people, even sinful people; but only the Holy Spirit can produce a LOST sinner. No law, system of works, nor moral code can do him any good.
The second difficulty in conversion is to teach a man THE GOSPEL. Few there be that really find it. This gospel of God's FREE GRACE IN CHRIST comes to the lost sinner without any return on his part. It is the gift of God from beginning to end. Even repentance, faith, and good works are His fruit.
The third difficulty in conversion is to bring a believing sinner to REST all of his days in the same grace and love that took him in. We are chosen, called, and kept by His free grace.
"Here I raise mine Ebenezer:
Hither by Thy help I'm come;
And I hope by Thy good pleasure
Safely to arrive at home."