…to incite unregenerate people to a so-called moral life, on the ground merely of interest, of regard for the well-being of society, and even of love for their children, etc., is for the preacher unsuitable, save in very peculiar cases. He must first call men, as an ambassador for Christ, to be reconciled to God, must insist upon the indispensable need of regeneration through the Holy Spirit. Then, speaking to those who are looked upon as regenerate, he must, with all his might, urge them to true and high morality, not only on all other grounds, but as a solemn duty to God their Saviour.
J. A. Broadus, On the Preparation and Delivery of Sermons, P. 87