“Approaching it in one way, I see no essential difference between a line one calls 'abstract' and a 'fish'. But rather an essential likeness. This isolated line and the isolated fish alike are living beings with forces peculiar to them, though latent. They are forces of expression for these beings and of expression on human beings, because each has an impressive 'look' which manifests itself by its expression. But the voice of these latent forces is faint and limited. It is the environment of the line and the fish that brings about a miracle: the latent forces awaken, the expression becomes radiant… The environment is the composition. The composition is the organized sum of the interior functions (expressions) of every part of the work.”

The Futurist Reconstruction of the Universe (1915)

Quote in Mondrian's letter to Theo van Doesburg, Amsterdam, 1915; as cited in Letters of the great artists, Richard Friedenthal, Thames and Hudson, London, 1963, p. 234 (transl. Daphne Woodward)
1910's

22 September 1907
India's Rebirth
Context: It is the nature of human institutions to degenerate, to lose their vitality, and decay, and the first sign of decay is the loss of flexibility and oblivion of the essential spirit in which they were conceived. The spirit is permanent, the body changes; and a body which refuses to change must die. The spirit expresses itself in many ways while itself remaining essentially the same but the body must change to suit its changing environments if it wishes to live. There is no doubt that the institution of caste degenerated. It ceased to be determined by spiritual qualifications which, once essential, have now come to be subordinate and even immaterial and is determined by the purely material tests of occupation and birth. By this change it has set itself against the fundamental tendency of Hinduism which is to insist on the spiritual and subordinate the material and thus lost most of its meaning. The spirit of caste arrogance, exclusiveness and superiority came to dominate it instead of the spirit of duty, and the change weakened the nation and helped to reduce us to our present conditions.

Igor Stravinsky (1936). An Autobiography, p. 53-54.
1930s

The Notebooks of Leonardo da Vinci (1883), II Linear Perspective

physis
Source: Religion and Nothingness (1983), p. 149

As quoted in Michel Foucault (1991) by Didier Eribon, as translated by Betsy Wind, Harvard University Press, p. 282
Context: There are more ideas on earth than intellectuals imagine. And these ideas are more active, stronger, more resistant, more passionate than "politicians" think. We have to be there at the birth of ideas, the bursting outward of their force: not in books expressing them, but in events manifesting this force, in struggles carried on around ideas, for or against them. Ideas do not rule the world. But it is because the world has ideas (and because it constantly produces them) that it is not passively ruled by those who are its leaders or those who would like to teach it, once and for all, what it must think.

Letter to Sister Mary James Power (1 October 1934); published in The Wild God of the World : An Anthology of Robinson Jeffers (2003), edited by Albert Gelpi, p. 189; also partly quoted in the essay "Robinson Jeffers, Pantheist Poet" http://web.archive.org/20011119074326/members.aol.com/PHarri5642/jeffers.htm by John Courtney
Context: I believe that the Universe is one being, all its parts are different expressions of the same energy, and they are all in communication with each other, therefore parts of one organic whole. (This is physics, I believe, as well as religion.) The parts change and pass, or die, people and races and rocks and stars, none of them seems to me important in itself, but only the whole. This whole is in all its parts so beautiful, and is felt by me to be so intensely in earnest, that I am compelled to love it and to think of it as divine. It seems to me that this whole alone is worthy of the deeper sort of love and there is peace, freedom, I might say a kind of salvation, in turning one's affections outward toward this one God, rather than inwards on one's self, or on humanity, or on human imaginations and abstractions — the world of spirits.
I think it is our privilege and felicity to love God for his beauty, without claiming or expecting love from him. We are not important to him, but he to us.

Laws of Motion, II
Philosophiae Naturalis Principia Mathematica (1687)