Technique is really personality. That is the reason why the artist cannot teach it, why the pupil cannot learn it, and why the aesthetic critic can understand it. To the great poet, there is only one method of music - his own. To the great painter, there is only one manner of painting - that which he himself employs. The aesthetic critic, and the aesthetic critic alone, can appreciate all forms and all modes. It is to him that Art makes her appeal.
A map of the world that does not include Utopia is not worth even glancing at, for it leaves out the one country at which Humanity is always landing. And when Humanity lands there, it looks out, and, seeing a better country, sets sail. Progress is the realisation of Utopias.
As for borrowing Mr. Whistler's ideas about art, the only thoroughly original ideas I have heard him express have had reference to his own superiority as a painter over painters greater than himself.