“Logic is justly considered the basis of all other sciences, even if only for the reason that in every argument we employ concepts taken from the field of logic, and that ever correct inference proceeds in accordance with its laws.”

— Alfred Tarski

Introduction to Logic: and to the Methodology of Deductive Sciences. (1941/2013) Tr. Olaf Helmer, pp. 108-110.

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Alfred Tarski 6

Polish-American logician 1901–1983

Rudolf Carnap (1891–1970) German philosopher

Foreword
Logical Syntax of Language, 1934/1937

“The concept of absolute, hence (or whence) springs, in the moral field, the moral laws or norms, represent, in the field of knowledge, the principle of identity, which is the fundamental law of the thought; norms of logic springs from it, that govern the thought (or mind) in the field of science.”

African Spir (1837–1890) Russian philosopher

"Le concept de l'absolu, d'où découlent, dans le domaine moral, les lois ou normes morales, constitue, le principe d'identité, qui est la loi fondamentale de la pensée; il en découle les normes logiques qui régissent la pensée dans le domaine de la science."
Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 59 [Hélène Claparède-Spir had underlined - the translator]

“All logical arguments can be defeated by the simple refusal to reason logically”

Steven Weinberg (1933) American theoretical physicist

Source: Dreams of a Final Theory

“The concept of logical thinking is selection and this is brought about by the processes of acceptance and rejection. Rejection is the basis of logical thinking.”

Edward de Bono (1933) Maltese physician

Source: Lateral Thinking : Creativity Step by Step (1970), p. 159.

“The concept of logical thinking is selection and this is brought about by the processes of acceptance and rejection. Rejection is the basis of logical thinking.”

Edward de Bono (1933) Maltese physician

Source: Lateral Thinking : Creativity Step by Step (1970), p. 159

“Reason perceives the general and proceeds by logical operations, whereas Intellect perceives the principial − the metaphysical − and proceeds by intuition.”

Frithjof Schuon (1907–1998) Swiss philosopher

[2006, Gnosis: Divine Wisdom, World Wisdom, 36, 978-1-933316-18-5]
Human being, Intellect

“His logic may be airtight but his argument, far from revealing the delusions of living experience, only exposes the limitations of logic.”

Edward Abbey (1927–1989) American author and essayist

Source: The Journey Home (1977), p. 121
Context: As for the "solitary confinement of the mind," my theory is that solipsism, like other absurdities of the professional philosopher, is a product of too much time wasted in library stacks between the covers of a book, in smoke-filled coffeehouses (bad for brains) and conversation-clogged seminars. To refute the solipsist or the metaphysical idealist all that you have to do is take him out and throw a rock at his head: if he ducks he's a liar. His logic may be airtight but his argument, far from revealing the delusions of living experience, only exposes the limitations of logic.

“What we cannot express by the art of thinking, by the art of Science or philosophy or logic, we can and should express by the poetic, visual, or some other arts. It is for that reason that I consider morals and aesthetics one and the same; for they cover only one impulse, one drive inherent in our consciousness - to bring our life and all our actions into a satisfactory relationship with the events of the world, as our consciousness want it to be, in harmony with our life and according to the laws of consciousness itself - Naum Gabo”

Naum Gabo (1890–1977) Russian sculptor

Quote from The Quotable Artist, by Peggy Hadden; Skyhorse Publishing, Inc., 2010; not paged
undated

“Logic is not concerned with human behavior in the same sense that physiology, psychology, and social sciences are concerned with it. These sciences formulate laws or universal statements which have as their subject matter human activities as processes in time. Logic, on the contrary, is concerned with relations between factual sentences (or thoughts). If logic ever discusses the truth of factual sentences it does so only conditionally, somewhat as follows: if such-and-such a sentence is true, then such-and-such another sentence is true. Logic itself does not decide whether the first sentence is true, but surrenders that question to one or the other of the empirical sciences.”

Rudolf Carnap (1891–1970) German philosopher

Rudolf Carnap (1937) cited in: Irving J. Lee (1967) The Language of Wisdom and Folly: Background Readings in Semantics. International Society for General Semantics, p. 44

“All traditional logic habitually assumes that precise symbols are being employed. It is therefore not applicable to this terrestial life but only to an imagined celestial existence… logic takes us nearer to heaven than other studies.”

Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist

'Vagueness' http://www.personal.kent.edu/~rmuhamma/Philosophy/RBwritings/vagueness.htm, first published in The Australasian Journal of Psychology and Philosophy, 1 June, 1923
1920s

“Logic is justly considered the basis of all other sciences, even if only for the reason that in every argument we employ concepts taken from the field of logic, and that ever correct inference proceeds in accordance with its laws.”

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Alfred Tarski 6

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