This exchange – mainly in the form of letters [between the brothers van Gogh] – was not only about painting and art, but covered everything to do with one's existence and the philosophical or religious colouring, in a word: for the reader of the letters written by Vincent to his brother a total of human behaviour is revealed that of the dual being of van Gogh. This is how my first wish and then obsession was started, to build a monument for the two van Gogh brothers.

'Les frères Van Gogh, origine et justification', c. 1955, pp. 67-69