“Every sentence in order to have definite scientific meaning must be practically or at least theoretically verifiable as either true or false upon the basis of experimental measurements either practically or theoretically obtainable by carrying out a definite and previously specified operation in the future. The meaning of such a sentence is the method of its verification.”

Source: Statistical Method from the Viewpoint of Quality Control, 1939, p. 94

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Walter A. Shewhart10

American statistician 1891–1967

J. L. Austin (1911–1960) English philosopher

Austin (1962) Sense and Sensibilia p. 111.

“If the meanings of true and false were switched, this sentence wouldn't be false.”

Douglas Hofstadter book I Am a Strange Loop

I Am a Strange Loop (2007) p. 68

“If we wish to express our ideas in terms of the concepts synthetic and analytic, we would have to point out that these concepts are applicable only to sentences that can be either true of false, and not to definitions. The mathematical axioms are therefore neither synthetic nor analytic, but definitions. …Hence the question of whether axioms are a priori becomes pointless since they are arbitrary.”

Hans Reichenbach (1891–1953) American philosopher

The Philosophy of Space and Time (1928, tr. 1957)

“The subject of philosophy is very ancient. The word means: "The love, study or pursuit of wisdom, or of knowledge of things and their causes, whether theoretical or practical."”

L. Ron Hubbard (1911–1986) American science fiction author, philosopher, cult leader, and the founder of the Church of Scientology

All we know of science or of religion comes from philosophy. It lies behind and above all other knowledge we have or use. <br class="br"> My Philosophy (1965) http://www.foundingchurchdc.org/dc/ref/philo/index.htm.

“Just as you can practice three - word sentences or sentences that travel across time zones, so can you practice writing sentences that breathe unshakable conviction.”

Stanley Fish (1938) American academic

Source: How To Write A Sentence And How To Read One (2011), Chapter 5, The Subordinate Style, p. 48

“By the logical syntax of a language, we mean the formal theory of the linguistic forms of that language -- the systematic statement of the formal rules which govern it together with the development of the consequences which follow from these rules. A theory, a rule, a definition, or the like is to be called formal when no reference is made in it either to the meaning of the symbols (for examples, the words) or to the sense of the expressions (e. g. the sentences), but simply and solely to the kinds and order of the symbols from which the expressions are constructed.”

Rudolf Carnap (1891–1970) German philosopher

Source: Logical Syntax of Language, 1934/1937, p. 1