Sincerity and Authenticity"Now and then," writes Lionel Triling "it is possible to observe the moral life in process of revising itself." In this new book he is concerned with such a mutation: the process by which the arduous enterprise of sincerity, of being true to one's self, came to occupy a place of supreme importance in the moral life and the further shift which finds that place now usurped by the darker and still more strenuous modern ideal of authenticity. Instances