Cubism is not a manner but an aesthetic, and even a state of mind; it is therefore inevitably connected with every manifestation of contemporary thought. It is possible to invent a technique or a manner independently, but one cannot invent the whole complexity of a state of mind.

Response to a questionnaire, from "Chez les cubistes," Bulletin de la Vie Artistique, ed. Félix Fénéon, Guillaume Janneau et al (1925-01-01); trans. Daniel-Henry Kahnweiler, Juan Gris, His Life and Work (1947)