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.
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.
Boredom is... a vital problem for the moralist, since half the sins of mankind are caused by the fear of it. Bertrand Russell
The moralist is the person who tells people that they ought to be unselfish, when they still feel like egos, and his efforts are always and invariably futile. Alan Watts
Don't make me into this airy-fairy, moralist, idealist because I'm not. Madeleine Albright
Ages when custom is unsettled are necessarily ages of prophecy. The moralist cannot teach what is revealed; he must reveal what can be taught. He has to seek insight rather than to preach. Walter Lippmann
Though sages may pour out their wisdom's treasure, there is no sterner moralist than pleasure. Lord Byron