Moralist

Webster's Dictionary of the English Language

·noun One who moralizes; one who teaches or animadverts upon the duties of life; a writer of essays intended to correct vice and inculcate moral duties.

II. Moralist ·noun One who practices moral duties; a person who lives in conformity with moral rules; one of correct deportment and dealings with his fellow-creatures;

— sometimes used in contradistinction to one whose life is controlled by religious motives.