“Any kind of material form whatever, whether past, future, or present, internal or external, gross or subtle, inferior or superior, far or near, all material form should be seen as it actually is with proper wisdom thus: “This is not mine, this I am not, this is not my self.””

“The medium is as unimportant as I myself. Essential is only the forming... I take any material whatsoever if the picture demands it. When I adjust materials of different kinds to one another, I have taken a step in advance of mere oil painting, for in addition to playing off color against color, line against line, form against form etc., I play off material against material, wood against sack clothes.”

“Far from it be the notion that the Supreme Being is corporeal, having a material form.”

“Presentism implies not only a shift toward contemporary material (older material is denounced polemically as tied to dead authors), but an implicit structuring of time as always only a present, without a recollection of its past, without an aspiration to a future.”

“If you seek reality you must set yourself free of all backgrounds, of all cultures, of all patterns of thinking and feeling. Even the idea of being man or woman, or even human should be discarded. The ocean of life contains all, not only humans. So, first of all abandon all self-identification, stop thinking of yourself as such-and-such or so-and-so, this or that. Abandon all self-concern, worry not about your welfare, material or spiritual, abandon every desire, gross or subtle, stop thinking of achievement of any kind. You are complete here and now, you need absolutely nothing.”

“My work is atheistic, materialistic and communistic. It's atheistic because it's without transcendent form, without spiritual or intellectual quality. Materialistic because it's made out of it's own materials without pretension to other materials. And communistic because the form is equally accessible to all men.”

“There is a lot of model making in my work, also because I am the son of a sculptor Giannino Castiglioni and I always saw my father working with his hands and shaping material into the desired form.”

“Of all the discoveries which men need to make, the most important, at the present moment, is that of the self-forming power treasured up in themselves. They little suspect its extent, as little as the savage apprehends the energy which the mind is created to exert on the material world.”

“Logic is the science not of external forms of thought, but of the laws of development "of all material, natural and spiritual things", i. e., of the development of the entire concrete content of the world and of its cognition, i. e., the sum-total, the conclusion of the History of knowledge of the world.”

“I am, indeed, an absolute materialist so far as actual belief goes; with not a shred of credence in any form of supernaturalism—religion, spiritualism, transcendentalism, metempsychosis, or immortality.”