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“When I met Wittgenstein, I saw that Schlick's warnings were fully justified. But his behavior was not caused by any arrogance. In general, he was of a sympathetic temperament and very kind; but he was hypersensitive and easily irritated. Whatever he said was always interesting and stimulating and the way in which he expressed it was often fascinating. His point of view and his attitude toward people and problems, even theoretical problems, were much more similar to those of a creative artist than to those of a scientist; one might almost say, similar to those of a religious prophet or a seer. When he started to formulate his view on some specific problem, we often felt the internal struggle that occurred in him at that very moment, a struggle by which he tried to penetrate from darkness to light under an intense and painful strain, which was even visible on his most expressive face. When finally, sometimes after a prolonged arduous effort, his answers came forth, his statement stood before us like a newly created piece of art or a divine revelation. Not that he asserted his views dogmatically ... But the impression he made on us was as if insight came to him as through divine inspiration, so that we could not help feeling that any sober rational comment of analysis of it would be a profanation.”
― Rudolf Carnap, The Philosophy of Rudolf Carnap, Volume 11

“Logic is the last scientific ingredient of Philosophy; its extraction leaves behind only a confusion of non-scientific, pseudo problems.”
― Rudolf Carnap, The Unity of Science

“Let us be cautious in making assertions and critical in examining them, but tolerant in permitting linguistic forms.
[Carnap’s famous plea for tolerance to which W.V. Quine took exception.]”
― Rudolf Carnap

“Anything you can do, I can do meta”
― Rudolf Carnap

“The self is the class (not the collection) of the experiences (or autopsychological states). The self does not belong to the expression of the basic experience, but is constructed only on a very high level.”
― Rudolf Carnap, The Logical Structure of the World and Pseudoproblems in Philosophy

“Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements.”
― Rudolf Carnap, The Unity of Science

“Les métaphysiciens sont des musiciens sans dons musicaux.”
― Rudolf Carnap

“If one is interested in the relations between fields which, according to customary academic divisions, belong to different departments, then he will not be welcomed as a builder of bridges, as he might have expected, but will rather be regarded by both sides as an outsider and troublesome intruder.”
― Rudolf Carnap

“We admit as legitimate mathematics certain reflections on the grammar of a language that concerns the empirical. If one seeks to formalize such a mathematics, then with each formalization there are problems, which one can understand and express in ordinary language, but cannot express in the given formalized language. It follows (Brouwer) that mathematics is inexhaustible: one must always again draw afresh from the “fountain of intuitionâ€�. There is, therefore, no characteristica universalis for the whole mathematics, and no decision procedure for the whole mathematics. In each and every closed language there are only countably many expressions. The continuum appears only in “the whole of mathematicsâ€� â€� If we have only one language, and can only make “elucidationsâ€� about it, then these elucidations are inexhaustible, they always require some new intuition again.”
― Rudolf Carnap

“Our conjecture that metaphysics is a substitute, albeit an inadequate one, for art, seems to be further confirmed by the fact that the metaphysician who perhaps had artistic talent to the highest degree, viz Nietzsche, almost entirely avoided the error of that of confusion. A large part of his work has predominantly empirical content. We find there, for instance, historical analyses of specific artistic phenomena, or an historical psychological analysis of morals, In the work, however, in which he expresses most strongly that which others express through metaphysics or ethics, in Thus Spake Zarathustra, he does not choose the misleading theoretical form, but openly form of art, of poetry.”
― Rudolf Carnap

“To accept the thing world means nothing more than to accept a certain form of language, in other words, to accept rules for formulating statements and for testing, accepting, or rejecting them.”
― Rudolf Carnap, Empiricism, Semantics, and Ontology

“Metaphysiker sind Musiker ohne musikalische Fähigkeit.”
― Rudolf Carnap, The Elimination of Metaphysics Through Logical Analysis of Language

“If someone wishes to speak in his language about a new kind of entities, he must introduce a system of new ways of speaking, subject to new rules; we shall call this procedure the construction of a linguistic framework for the new entities in question.”
― Rudolf Carnap, Empiricism, Semantics, and Ontology

“Wir werden einen Satz wie "Die Welt ist die Selbstverwirklichung Gottes" nicht widerlegen, indem wir etwa zu beweisen versuchen: "Die Welt ist nicht die Selbstverwirklichung Gottes". Damit würden wir, wo die Metaphysiker den Bock melken, das Sieb unterhalten.”
― Rudolf Carnap

“The conditions of the truth of sentences in a system need not be found outside the system [or convention], but must be provided within it.”
― Rudolf Carnap