Felicity comes more easily to Smith than it used to. But it is still by no means an easy felicity. I am not able to talk about the content of Smith’s art because I am no more able to find words for it than the ultimate content of Quercia’s or Rodin’s art. But I can see that Smith’s felicities are won from a wealth of content, of things to say; and this is the hardest, and most lasting, way in which they can be won. The burden of content is what keeps an artist going, and the wonderful thing about Smith is the way that burden seems to grow with his years instead of shrinking.
-Clement Greenberg, 1964