“I believe that in our period it is definitely necessary that, as far as possible, the paint is applied in pure colours, set next to each other in a pointillist or diffuse manner. This is stated strongly, and yet it relates to the idea which is the basis of meaningful expression in form, as I see it. It seems to me that the clarity of ideas should be accompanied by a clarity of technique.”
Quote in Mondrian's letter to Israel Querido, Summer of 1909; published in the weekly magazine 'De Controleur' 23 Oct, 1909; as cited in English translation, in Two Mondrian sketchbooks 1912 - 1914, ed. Robert P. Welsh & J. M. Joosten, Amsterdam 1969 p. 10
1900's
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Piet Mondrian 95
Peintre Néerlandais 1872–1944Related quotes

Source: "Quotes", Notebooks and Lectures on the Bible and Other Religious Texts (2003), p. 8

In Tiger’s Eye, Vol. 1, no 9, October 1949; as quoted in Abstract Expressionism Creators and Critics, ed. Clifford Ross, Abrams Publishers New York 1990, p. 170
1940's
Introduction, The Nature of Probability Theory, p. 2 - 3.
An Introduction To Probability Theory And Its Applications (Third Edition)

Source: 1930s, Adventures of Ideas (1933), p. 91.
Context: In the study of ideas, it is necessary to remember that insistence on hard-headed clarity issues from sentimental feeling, as if it were a mist, cloaking the perplexities of fact. Insistence on clarity at all costs is based on sheer superstition as to the mode in which human intelligence functions. Our reasoning grasps at straws for premises and float on gossamer for deductions.

Source: before 1960, "Yves Klein, 1928 – 1962, Selected Writings", p. 15

“Clarity of text is the sole incontrovertible sign of the maturity of an idea.”
Sucesivos Escolios a un Texto Implícito (1992)