Philosophy Quotes

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

43879 quotes

P
"Ordinary language is often our best guide to metaphysics."
Putnam, Hilary
P
"Philosophy is a conversation across centuries."
Putnam, Hilary
P
"The naturalistic assumption does not solve philosophical problems."
Putnam, Hilary
P
"Materialism is not the only scientifically respectable worldview."
Putnam, Hilary
P
"The universe is not a closed causal system."
Putnam, Hilary
P
"Responsibility is a pragmatic concept rooted in practice."
Putnam, Hilary
P
"Ethics cannot be reduced to facts about human nature."
Putnam, Hilary
P
"Moral disagreement reflects genuine indeterminacy, not mere opinion."
Putnam, Hilary
P
"Democracy is not the perfect system, but it remains defensible."
Putnam, Hilary
P
"Political philosophy must remain connected to actual human struggles."
Putnam, Hilary
P
"Culture is not a veil separating us from reality."
Putnam, Hilary
P
"The future of philosophy lies in engagement with science and culture."
Putnam, Hilary
C
"Logic is the foundation upon which all rational thought is built."
Church, Alonzo
C
"Every algorithm can be expressed in the lambda calculus; this reveals something profound about the nature of computation."
Church, Alonzo
C
"Logic without intuition is empty; intuition without logic is blind."
Church, Alonzo
C
"Computation is not merely a practical tool; it is a fundamental concept in nature."
Church, Alonzo
C
"The lambda calculus is a universe unto itself, complete and self-contained."
Church, Alonzo
C
"Logic and intuition need not be in conflict; they are complementary ways of knowing."
Church, Alonzo
C
"The lambda calculus showed that different models of computation are fundamentally equivalent."
Church, Alonzo
C
"Formal systems are games, but games with absolute rules and objective truth values."
Church, Alonzo
C
"To work with formal systems is to engage in pure thought, uncontaminated by empirical accident."
Church, Alonzo
C
"The study of recursion theory is ultimately a study of the nature of thought."
Church, Alonzo
C
"Logic is the science of eternal truths; empiricism is the art of temporal facts."
Church, Alonzo
C
"To work with formal systems is to participate in humanity's ongoing dialogue with truth itself."
Church, Alonzo
T
"In the time of chimpanzees I was a monkey."
Turing, Alan
T
"Only a man's own fundamental assumptions are more interesting to him than the supposed intellectual center of the universe."
Turing, Alan
T
"Can a machine be conscious? No, because consciousness requires something that machines do not have."
Turing, Alan
T
"A very large part of space-time near the observer's body is occupied by material of very little interest."
Turing, Alan
T
"The original question, 'Can machines think?' I believe to be too meaningless to deserve discussion."
Turing, Alan
T
"The degree to which we regard something as thinking is determined by our own capacity to understand it."
Turing, Alan