Philosophy Quotes

Questions about meaning, existence, and truth from thinkers who spent their lives searching for answers.

43879 quotes

T
"The foundations of mathematics rest on axioms that we accept without proof, by an act of intellectual faith."
Tarski, Alfred
T
"Nominalism and realism in mathematics are not merely different opinions; they are different ways of seeing the world."
Tarski, Alfred
T
"Quantification over infinite domains introduces complexities that finite minds must strain to comprehend."
Tarski, Alfred
T
"The relationship between language and reality is not one of simple mirroring but of complex interpretation."
Tarski, Alfred
T
"The paradox of the liar sentence shows that truth and falsity are not exhaustive categories for all linguistic expressions."
Tarski, Alfred
T
"The quest for a complete description of reality must reckon with Gödel's incompleteness theorems."
Tarski, Alfred
T
"In formal languages, ambiguity is the enemy; in natural languages, it is often the friend of efficiency and flexibility."
Tarski, Alfred
T
"The law of non-contradiction is not a law of nature but a law of thought we find ourselves unable to violate."
Tarski, Alfred
T
"Formal systems are elegant precisely because they achieve much while assuming little."
Tarski, Alfred
T
"The semantic ascent from talking about objects to talking about words about objects is not a mere change of subject."
Tarski, Alfred
T
"Every language contains within it a metaphysics; to change our language is to change our conception of what exists."
Tarski, Alfred
C
"Logic is the anatomy of thought."
Church, Alonzo
C
"Formalism without intuition produces sterile symbol manipulation; intuition without formalism produces vague speculation."
Church, Alonzo
C
"Every system of logic contains the seeds of its own questions."
Church, Alonzo
C
"Axioms are assumptions we accept to explore their consequences."
Church, Alonzo
C
"Formal systems are mirrors in which we see the reflection of our own thought."
Church, Alonzo
C
"Logic is the discipline of necessary inference."
Church, Alonzo
C
"Logic without intuition is blind; intuition without logic is empty."
Church, Alonzo
C
"Logic is the art of maintaining consistency while exploring possibility."
Church, Alonzo
C
"An axiom is a statement we choose to accept as the basis for further reasoning."
Church, Alonzo
C
"The paradoxes of self-reference teach us to refine our understanding of logical foundation."
Church, Alonzo
P
"The mind and the world jointly make up the mind and the world."
Putnam, Hilary
P
"Rationality is not about discovering a single right answer, but about navigating multiple perspectives."
Putnam, Hilary
P
"Metaphysics is not the study of reality itself, but of our ways of talking about reality."
Putnam, Hilary
P
"The notion of an ideal language is a philosophical fantasy."
Putnam, Hilary
P
"We are trapped in the web of our own language, yet that web connects us to everything."
Putnam, Hilary
P
"Realism without a ready-made world is still realism."
Putnam, Hilary
P
"The internal realist says: yes, there is a world, but we make it through our concepts."
Putnam, Hilary
P
"Analytic philosophy and Continental philosophy need not be at war."
Putnam, Hilary
P
"The verification principle is self-refuting; we cannot verify that only verifiable statements are meaningful."
Putnam, Hilary