Each one of us [artists] has several facets. The surface often appears more important than what is inside, hence the errors of those who judge carelessly. How many times has that not happened to me! The surface is often complete in some people from the very beginning, but not the possession of their own sensations. From this come errors. Some natures achieve the surface very slowly j this is the least danger an artist runs. So one should not think of the surface or the appearance, but concentrate on what is inner!