I appreciate Iain H.Murray . I don't agree with some things he has written . But I especially enjoy his biographies of Pink , Lloyd-Jones , Jn. Edwards , John Murray etc. One of his more recent works is " The Old Evangelicalism : Old Truths For A New Awakening " . He wants a return to the old paths ( and he doesn't mean of the last 100 or so years ) . He has some good quotes of men of the past who he thinks were more biblical regarding the proclamation of the Word of God . He develops his own thoughts as well as citing relevant scriptures . Chapter one is Preaching And Awakening " . On page 37 he cites Dr.L-J as saying : It is the law of God alone that really gives us a right conception of the true character and nature of sin . This is a tremendous proposition . The real trouble with the unregenerate is that they do not know and understand the truth about sin . They have their moral code , they believe that certain things are right and certain things are wrong ; but that is not to understand sin . The moment a man understands the true nature and character of sin he becomes troubled about his soul and seeks for a Saviour . It is the peculiar function of the law to bring such an understanding to a man's mind and conscience . That is why great evangelical preachers three hundred years ago in the time of the Puritans , and two hundred years ago in the time of Whitefield and others , always engaged in what they called a preliminary " law work " . In their preaching of the Gospel they generally started with a presentation of the Law . They knew that a man would not understand salvation unless he understood the nature of sin .