“Know that for the human mind there are certain objects of perception which are within the scope of its nature and capacity; on the other hand, there are, amongst things which actually exist, certain objects which the mind can in no way and by no means grasp: the gates of perception are closed against it. Further, there are things of which the mind understands one part, but remains ignorant of the other; and when man is able to comprehend certain things, it does not follow that he must be able to comprehend everything.”

— Maimónides , book The Guide for the Perplexed

Source: Guide for the Perplexed (c. 1190), Part I, p.106 (1881) Tr. Friedlander

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Maimónides 180

rabbi, physician, philosopher 1138–1204

Pierre-Paul Grassé (1895–1985) French zoologist

Dieu existe? Oui http://books.google.com.mx/books/about/Dieu_existe_Oui.html?id=TBUCHQAACAAJ&redir_esc=y (1979). Paris. Stock. Christian Chabanis, p. 94.
Original: L’ordre naturel n’est pas une invention de l’esprit humain et une mise en place de certaines propriétés d’observation... Qui dit ordre dit intelligence organisatrice. Cette intelligence ne peut être que celle de Dieu.

“[T]his cancer of the mind which consists of thinking all too sadly that certain things 'are' while others, which well might be, 'are not.”

André Breton (1896–1966) French writer

Quote from Deuxième Manifeste du Surréalisme, Andre Breton (Second Manifesto of Surrealism; 1930)
1920's

“In a certain sense human activity systems do not exist, only perceptions of them exist, perceptions which are associated with specific Ws.”

Peter Checkland (1930) British management scientist

Source: Systems Thinking, Systems Practice, 1981, p. 219 as cited in: Robert L. Flood, Norma R.A. Romm (1997) Critical Systems Thinking. p. 206

“This must be our belief when we have a correct knowledge of our own self, and comprehend the true nature of everything; we must be content, and not trouble our mind with seeking a certain final cause for things that have none, or have no other final cause but their own existence, which depends on the Will of God, or, if you prefer, on the Divine Wisdom.”

Maimónides book The Guide for the Perplexed

Source: Guide for the Perplexed (c. 1190), Part III, Ch.13

“Now if you do have a perception that any conceivable consideration may be utterly invalidated by some other consideration which you do not know, and if you are reminded of this perception constantly by the fact that things exist, certain modifications take place in the way you feel about things. These modifications have not taken place in the psychology of most people.”

Celia Green (1935) British philosopher

Advice to Clever Children (1981)

“Greek thought was essentially non-algebraic, because it was so concrete. The abstract operations of algebra, which deal with objects that have been purposely stripped of their physical content, could not occur to minds which were so intently interested in the objects themselves. The symbol is not a mere formality; it is the very essence of algebra. Without the symbol the object is a human perception and reflects all the phases under which the human senses grasp it; replaced by a symbol the object becomes a complete abstraction, a mere operand subject to certain indicated operations.”

Tobias Dantzig (1884–1956) American mathematician

p, 125
Number: The Language of Science (1930)

“... The fallacious use of the principle that you cannot look into a man's mind. It is said you cannot do that: therefore what follows? It is said that you are to have fixed rules to tell you that he must have meant something, one way or the other, when certain exterior phenomena arise. The answer is that there is no such thing as an absolute criterion which gives you certain index to a man's mind. There is nothing outside his mind which is an absolute indication of what is going on inside. So far from saying that you cannot look into a man's mind, you must look into it, if you are going to find fraud against him: and unless you think you see what must have been in his mind, you cannot find him guilty of fraud.”

Charles Bowen (1835–1894) English judge

Angus v. Clifford (1891), L. R. 2 C. D. [1891], p. 471.

“I must avert here once again to my view of the opposition that exists between individuality and personality, notwithstanding the fact that the one demands the other. Individuality is, if I may so express it, the container or thing which contains, personality the content or thing contained, or I might say that my personality is in a certain sense my comprehension, that which I comprehend or embrace within myself — which is in a certain way the whole Universe — and that my individuality is my extension; the one my infinite, the other my finite.”

Miguel de Unamuno (1864–1936) 19th-20th century Spanish writer and philosopher

The Tragic Sense of Life (1913), VIII : From God to God

“It is immaterial whether these exist or not. By doing certain things certain results will follow; students are most earnestly warned against attributing objective reality or philosophic validity to any of them.”

Aleister Crowley (1875–1947) poet, mountaineer, occultist

Book VI : Liber O (1909)
Context: In this book it is spoken of the Sephiroth and the Paths; of Spirits and Conjurations; of Gods, Spheres, Planes, and many other things which may or may not exist. It is immaterial whether these exist or not. By doing certain things certain results will follow; students are most earnestly warned against attributing objective reality or philosophic validity to any of them.

“Idea or Vision, in its sensuous meaning, would be something that could be perceived only by the bodily eye and not by any other sense such as taste, hearing, etc.; it would be such a thing as a rainbow, or the forms which pass before us in dreams. Idea or Vision, in its supersensuous meaning, would denote, first of all, in conformity with the sphere in which the word is to be valid, something that cannot be perceived by the body at all, but only by the mind; and then, something that cannot, as many other things can, be perceived by the dim feeling of the mind, but only by the eye of the mind, by clear perception.”

Johann Gottlieb Fichte book Address to the German Nation

The Chief Difference Between The Germans And The Other Peoples Of Teutonic Descent p. 59
Addresses to the German Nation (Reden an die deutsche Nation) 1808, Fourth Address

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Maimónides 180

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