“Each new ontological theory, propounded in lieu of previous ones shown to be untenable, has been followed by a new criticism leading to a new scepticism. All possible conceptions have been one by one tried and found wanting; and so the entire field of speculation has been gradually exhausted without positive result: the only result reached being the negative one above stated, that the reality existing behind all appearances is, and must ever be, unknown.”
Pt. I, The Unknowable; Ch. IV, The Relativity of All Knowledge
First Principles (1862)
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Herbert Spencer 81
English philosopher, biologist, sociologist, and prominent … 1820–1903Related quotes

As quoted in Beyond Positivism and Relativism : Theory, Method, and Evidence (1996) by Larry Laudan, p. 259

De cette alliance nouvelle, car jusqu'ici les décors et les costumes, d'une part, la choréographie, d'autre part, n'avaient entre eux qu'un lien factice, il est résulté, dans Parade, une sorte de sur-réalisme.
Excelsior, May 11, 1917; translation from Michael Benedikt & George E. Wellwarth (eds.) Modern French Theatre (New York: Dutton, 1964) p. xvii.
The first usage of the word surrealism in any language.
Source: One Nation Under God: How Corporate America Invented Christian America (2015), p. 292
Advanced macroeconomics 4th ed. (2011), "Preface to the Fourth Edition"

Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 59
Context: Electromagnetic fields are not of the mind... Creation may be spiritual in origin, but that doesn't mean that everything created is spiritual. How can I explain such things to you? Let us accept the world is a mystery. Nature is neither solely material nor entirely spiritual. Man, too, is more than flesh and blood; otherwise, no religions would have been possible. Behind each cause is still another cause; the end or the beginning of all causes has yet to be found. Behind each cause is still another cause; the end or the beginning of all causes has yet to be found. Yet, only one thing must be remembered: there is no effect without a cause, and there is no lawlessness in creation".

Psychedelic Society (1984)
Context: Our ability to destroy ourselves is the mirror image of our ability to save ourselves, and what is lacking is the clear vision of what should be done... What needs to be done is that fundamental, ontological conceptions of reality need to be redone. We need a new language, and to have a new language we must have a new reality... A new reality will generate a new language, a new language will fix a new reality, and make it part of this reality.