“Space and time are the only forms on which life is built and hence art must be constructed… The realisation of our perceptions of the world in the forms of space and time is the only aim of our pictorial and plastic art… We renounce the thousand-year-old delusion in art that held the static rhythms as the only elements of the plastic and pictorial arts. We affirm in these arts a new element, the kinetic rhythms as the basic forms of our perception of real time.”

Quote from the first and only! issue of the art-magazine 'Art Concret', Paris 1930
1926 – 1931

Theo Jansen, quoted in: " 2015 International Kinetic Art Exhibit & Symposium - Boynton Beach, FL, USA http://intlkineticartevent.org/?page_id=107," 2015

Vague Thoughts On Art (1911)
Context: I cannot help thinking that historians, looking back from the far future, will record this age as the Third Renaissance. We who are lost in it, working or looking on, can neither tell what we are doing, nor where standing; but we cannot help observing, that, just as in the Greek Renaissance, worn-out Pagan orthodoxy was penetrated by new philosophy; just as in the Italian Renaissance, Pagan philosophy, reasserting itself, fertilised again an already too inbred Christian creed; so now Orthodoxy fertilised by Science is producing a fresh and fuller conception of life — a love of Perfection, not for hope of reward, not for fear of punishment, but for Perfection's sake. Slowly, under our feet, beneath our consciousness, is forming that new philosophy, and it is in times of new philosophies that Art, itself in essence always a discovery, must flourish. Those whose sacred suns and moons are ever in the past, tell us that our Art is going to the dogs; and it is, indeed, true that we are in confusion! The waters are broken, and every nerve and sinew of the artist is strained to discover his own safety. It is an age of stir and change, a season of new wine and old bottles. Yet, assuredly, in spite of breakages and waste, a wine worth the drinking is all the time being made.

quote, 1937; last lines of Mondrian's publication in 'Circle'; as cited in Abstract Art, Anna Moszynska; Thames and Hudson, London 1990, p. 117
1930's

"Society, Morality and the Novel" (1957), in The Collected Essays, ed. John F. Callahan (New York: Modern Library, 1995), pp. 699-700.
Context: Perhaps the novel evolved in order to deal with man's growing awareness that behind the facade of social organisations, manners, customs, myths, rituals and religions of the post-Christian era lies chaos. Man knows, despite the certainties which it is the psychological function of his social institutions to give him, that he did not create the universe, and that the universe is not at all concerned with human values. Man knows that even in this day of marvelous technology and the tenuous subjugation of the atom, that nature can crush him, and that at the boundaries of human order the arts and the instruments of technology are hardly more than magic objects which serve to aid us in our ceaseless quest for certainty. We cannot live, as someone has said, in the contemplation of chaos, but neither can we live without an awareness of chaos, and the means through which we achieve that awareness, and through which we assert our humanity most significantly against it, is in great art. In our time the most articulate art form for defining ourselves and for asserting our humanity is the novel. Certainly it is our most rational art form for dealing with the irrational.

Introducing our Argument
Cannibals and Christians (1966)
Context: We live in a time which has created the art of the absurd. It is our art. It contains happenings, Pop art, camp, a theater of the absurd … Do we have the art because the absurd is the patina of waste…? Or are we face to face with a desperate or most rational effort from the deepest resources of the unconscious of us all to rescue civilization from the pit and plague of its bedding?

'Joseph Kosuth: Introductory note by the American editor', in Art-Language Vol.1 Nr.2, Art & Language Press, Chipping Norton (February 1970), p.3.

Quote in van Doesburg's article: 'Space – time and colour' in 'De Stijl', Aubette Issue, series xv, 87-9, 1928, pp. 26–27
1926 – 1931

Attributed