Following up to “Why so many self-help books?“.
According to David J. Gordon in Shavian comedy and the shadow of Wilde
But Wilde’s dandies are self-possessed because, paradoxically, there is no single self for them to defend, only a mask or persona to adopt opportunistically; it is in fact Wilde’s main argument against “sincerity” that it must be false because there are many selves.
His footnote cites The Picture of Dorian Gray
For the canons of good society are, or should be, the same as the canons of art. Form is absolutely essential to it. It should have the dignity of a ceremony, as well as its unreality, and should combine the insincere character of a romantic play with the wit and beauty that make such plays delightful to us. Is insincerity such a terrible thing? I think not. It is merely a method by which we can multiply our personalities.
Such, at any rate, was Dorian Gray’s opinion. He used to wonder at the shallow psychology of those who conceive the ego in man as a thing simple, permanent, reliable, and of one essence. To him, man was a being with myriad lives and myriad sensations, a complex multiform creature that bore within itself strange legacies of thought and passion, and whose very flesh was tainted with the monstrous maladies of the dead.
and The Critic As Artist
ERNEST. Well, at least, the critic will be sincere.
GILBERT. A little sincerity is a dangerous thing, and a great deal of it is absolutely fatal. The true critic will, indeed, always be sincere in his devotion to the principle of beauty, but he will seek for beauty in every age and in each school, and will never suffer himself to be limited to any settled custom of thought or stereotyped mode of looking at things. He will realise himself in many forms, and by a thousand different ways, and will ever be curious of new sensations and fresh points of view. Through constant change, and through constant change alone, he will find his true unity. He will not consent to be the slave of his own opinions. For what is mind but motion in the intellectual sphere? The essence of thought, as the essence of life, is growth. You must not be frightened by word, Ernest. What people call insincerity is simply a method by which we can multiply our personalities.
Aside: Unrelated to selves, but also about sincerity, from The Picture of Dorian Gray
“I don’t agree with a single word that you have said, and, what is more, Harry, I feel sure you don’t either.”
[…] “How English you are Basil! That is the second time you have made that observation. If one puts forward an idea to a true Englishman — always a rash thing to do — he never dreams of considering whether the idea is right or wrong. The only thing he considers of any importance is whether one believes it oneself. Now, the value of an idea has nothing whatsoever to do with the sincerity of the man who expresses it. Indeed, the probabilities are that the more insincere the man is, the more purely intellectual will the idea be, as in that case it will not be coloured by either his wants, his desires, or his prejudices. […]”