The doubts and fears of most Christians arise from hence because they have not a clear understanding of the difference between the covenant of grace and the covenant of works. There is nothing in the world would so satisfy the consciences of men and women so as a clear understanding of the Covenant of Grace and the Covenant of Works. Many people cry out of the preachers that they disquiet and trouble the hearts of people by their preaching. The Truth is no preachers occasion so much the trouble and perplexity of consciences as those that preach morality and merely the way of duty and never come to make them see clearly between the covenant of grace and the covenant of works. And I appeal unto you who are they who most quiet and settle your consciences and satisfy your spirits? Are they not those preachers that open the difference between the covenant of grace and the covenant of works? Certainly those preachers that show you what the covenant of grace is are the only men that quiet and satisfy the conscience and ’tis a truth that nothing can do it but that.
Jeremiah Burroughs, Gospel Remission (HT: Particular Voices)