“The excellence of every Art is its intensity.”

Introduction
The Wedge (1944)
Context: When a man makes a poem, makes it, mind you, he takes words as he finds them interrelated about him and composes them — without distortion which would mar their exact significances — into an intense expression of his perceptions and ardors that they may constitute a revelation in the speech that he uses. It isn’t what he says that counts as a work of art, it’s what he makes, with such intensity of perception that it lives with an intrinsic movement of its own to verify its authenticity.

Source: Demon Princes (1964-1981), The Palace of Love (1967), Chapter 7 (p. 356)

The Edinburgh Review, vol. 21 (1813), pp. 217-18

Book I, ch. 20.
Discourses

X magazine (1959-62)
Context: The Art of painting is itself an intensely personal activity. It may be labouring the obvious to say so but it is too little recognised in art journalism now that a picture is a unique and private event in the life of the painter: an object made alone with a man and a blank canvas... A real painting is something which happens to the painter once in a given minute; it is unique in that it will never happen again and in this sense is an impossible object. It is judged by the painter simply as a success or failure without qualification. And it is something which happens in life not in art: a picture which was merely the product of art would not be very interesting and could tell us nothing we were not already aware of. The old saying, “what you don’t know can’t hurt you”, expresses the opposite idea to that which animates the painter before his canvas. It is precisely what he does not know which may destroy him.

Source: The Soul of Man Under Socialism

“Design as a Principle in the Arts”, The Critical Path and Other Writings on Critical Theory, 1963–1975, p. 232
"Quotes"

Statement at the .
Context: Despite the fact that as an art, music cannot compromise its principles, and politics, on the other hand, is the art of compromise, when politics transcends the limits of the present existence and ascents to the higher sphere of the possible, it can be joined there by music. Music is the art of the imaginary par excellence, an art free of all limits imposed by words, an art that touches the depth of human existence, and art of sounds that crosses all borders. As such, music can take the feelings and imagination of Israelis and Palestinians to new unimaginable spheres.

Source: Towing Jehovah (1994), Chapter 12, “Father” (p. 337)