„Modern positivism…expresses criticism against the naïve use of certain terms… by the general postulate that the question whether a given sentence has any meaning… should always be thoroughly and critically examined. This… is derived from mathematical logic. The procedure of natural science is pictured as an attachment of symbols to the phenomena. The symbols can, as in mathematics, be combined according to certain rules… However, a combination of symbols that does not comply with the rules is not wrong but conveys no meaning.The obvious difficulty in this argument is the lack of any general criterion as to when a sentence should be considered meaningless. A definite decision is possible only when the sentence belongs to a closed system of concepts and axioms, which in the development of natural science will be rather the exception than the rule. In some case the conjecture that a certain sentence is meaningless has historically led to important progress… new connections which would have been impossible if the sentence had a meaning. An example… sentence: “In which orbit does the electron move around the nucleus?”“

— Werner Heisenberg

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„A dramatic necessity goes deep into the nature of the sentence. Sentences are not different enough to hold the attention unless they are dramatic.“
— Robert Frost
„My own feeling in the matter is due to my very firm conviction that to put such a motto on coins, or to use it in any kindred manner, not only does not good but does positive harm, and is in effect irreverence which comes dangerously close to sacrilege. A beautiful and solemn sentence such as the one in question should be treated and uttered only with that fine reverence which necessarily implies a certain exaltation of spirit.“
— Theodore Roosevelt
„A linguistic variable is a variable whose values are words or sentences in a natural or synthetic language.“
— Lotfi A. Zadeh