21 Is the law then against the promises of God? Certainly not! For if there had been a law given which could have given life, truly righteousness would have been by the law. 22 But the Scripture has confined all under sin, that the promise by faith in Jesus Christ might be given to those who believe. 23 But before faith came, we were kept under guard by the law, kept for the faith which would afterward be revealed. 24 Therefore the law was our tutor to bring us to Christ, that we might be justified by faith.
“Evangelism must start with the holiness of God, the sinfulness of man, the demands of the law, and the eternal consequences of evil.”
Dr. D. Martin Lloyd-Jones, Studies in the Sermon on the Mount, p. 235.
David Martyn Lloyd-Jones (20 December 1899 – 1 March 1981) was a Welsh Protestant minister, preacher and medical doctor who was influential in the Reformed wing of the British evangelical movement in the 20th century. For almost 30 years, he was the minister of Westminster Chapel in London.
(The page also contains two interviews with him and his documentary on George Whitefield.)
HT: Sherry, The History and Theology of Calvinism