“His [ Vincent van Gogh's] line is new and yet very old, and happily not a purely European affair. It is more a question of reform than of revolution.”
Quote (1911), Diary # 899; as cited by Francesco Mazzaferro, in 'The Diaries of Paul Klee Part Four', : Klee as an Expressionist and Constructivist Painter http://letteraturaartistica.blogspot.nl/2015/05/paul-klee-ev27.html
speaking in positive terms of Van Gogh and his way of using the line in painting
1911 - 1914
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Paul Klee 104
German Swiss painter 1879–1940Related quotes

version in original Dutch, Weissenbruch tegen Anton Mauve: Hij teekent verdomd goed, ik zou naar zijn studies kunnen werken.
a remark to Anton Mauve, who asked Weissenbruch to visit Vincent van Gogh and see his work
Source: J. H. Weissenbruch', (n.d.), p. 44, note 1


Source: 1940 - 1960, Les frères Van Gogh, origine et justification', c. 1955, p. 66

Source: 1940 - 1960, Les frères Van Gogh, origine et justification', c. 1955, pp. 67-69
To which the answer is, I would have thought, boring, bordering on pointless.
Think Like an Artist (2015)

Quotes, 1881 - 1890, Letter to Maurice Beaubourg', August 1890

The Act of Creation, London, (1970) p. 253.
Context: Einstein's space is no closer to reality than Van Gogh's sky. The glory of science is not in a truth more absolute than the truth of Bach or Tolstoy, but in the act of creation itself. The scientist's discoveries impose his own order on chaos, as the composer or painter imposes his; an order that always refers to limited aspects of reality, and is based on the observer's frame of reference, which differs from period to period as a Rembrant nude differs from a nude by Manet.