Nothing is more contradictory than to deny the spirit, or even simply the psychic element, in favor of matter alone, for it is the spirit that denies, whereas matter remains inert and unconscious. The fact that matter can be thought about proves precisely that MATERIALISM contradicts itself at its starting point, rather as with Pyrrhonism, for which it is true that there is no truth, or with relativism, for which all is relative except this affirmation. (GTUFS: PlayMasks, In the Face of Contingency)
The flagrant contradiction of MATERIALISM is the negation of the spirit by means of the spirit; that of existentialism, is making use of this negation as a basis from which to dismantle the normal functions of intelligence under the pretext of defending the rights of “existence” or the “concrete” against “abstraction.” “The more he blasphemes, the more he praises God,” says Eckhart; materialist and concretist ideologies, by the very excess of their inanity, bear witness indirectly to the reality of the spirit and consequently also to its primacy. (GTUFS: DivineHuman, Aspects of the Theophanic Phenomenon of Consciousness)