The intellectual abstraction of the second period of Cubism was of great importance, however. By its aspirations to the eternal and its 'concept of proportion inspired by the Classics' it revived the sense of craftsmanship concept in many painters. And this perfectly coincided with another of my ambitions – which was to make, with paint, an object having the same perfection of craftsmanship that a cabinet-maker would put into a piece of furniture.

p. 248 - after 1960, and posthumous - 'Letters of the great artists', 1963