[Futurism's].. superficial expression of velocity, the aeroplane, the racing-car and so on, is but a weak expression of the inner velocity of thought compared to which the velocity of radium represents nothing but inertia.... The mimetic expression of velocity (whatever its form may be: the aeroplane, the automobile, and so on) is diametrically opposed to the character of painting, the supreme origin of which is to be found in inner life.

In the Dutch art-magazine: 'Eenheid' (Dutch, for Unity) no. 127, 9 November 1912; as quoted in Theo van Doesburg, Joost Baljeu, Studio Vista, London 1974, p. 16