Philosophy Quotes

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

43879 quotes

B
"Mathematics is the pursuit of meaning through abstract form."
Brouwer, Luitzen Egbertus Jan
B
"The proof is the bridge between intuition and certainty."
Brouwer, Luitzen Egbertus Jan
B
"A mathematical truth is eternal only because it is eternally verifiable."
Brouwer, Luitzen Egbertus Jan
B
"Mathematics without meaning is mere symbol manipulation."
Brouwer, Luitzen Egbertus Jan
B
"In mathematics, necessity and freedom are one and the same."
Brouwer, Luitzen Egbertus Jan
H
"The infinite! No other question has ever moved so profoundly the spirit of man."
Hilbert, David
H
"We cannot think of any object, nor can we think any single thought, that would not depend upon the axioms of logic."
Hilbert, David
H
"Philosophy is the attempt to answer the deepest questions through reason alone."
Hilbert, David
H
"The infinite regression of causes must eventually resolve in something eternal."
Hilbert, David
H
"Every mathematical axiom is a question about the nature of existence itself."
Hilbert, David
F
"A thought is a sense-impression of the future."
Frege, Gottlob
F
"Without a sign we cannot have a thought."
Frege, Gottlob
F
"We must distinguish between the sign and what it signifies."
Frege, Gottlob
F
"Thoughts are not private mental entities but objective contents."
Frege, Gottlob
F
"Language mirrors the structure of logical reality."
Frege, Gottlob
F
"Concepts are fundamentally different from mental images."
Frege, Gottlob
F
"We cannot think without language, yet language can mislead us."
Frege, Gottlob
F
"The object of thought is independent of the thinker."
Frege, Gottlob
F
"The same sense can have different modes of presentation."
Frege, Gottlob
F
"The law of non-contradiction is the foundation of all reasoning."
Frege, Gottlob
F
"Concepts exist in a realm independent of human minds."
Frege, Gottlob
F
"Objects fall under concepts; concepts do not fall under objects."
Frege, Gottlob
F
"The meaning of a sentence is not the sum of word meanings."
Frege, Gottlob
F
"Thoughts exist independently of any particular person thinking them."
Frege, Gottlob
F
"The laws of logic are neither psychological nor physical laws."
Frege, Gottlob
F
"Language must be regimented to avoid philosophical confusion."
Frege, Gottlob
F
"Thoughts are the contents of judgments, not mental images."
Frege, Gottlob
F
"Objects are what fall under concepts; concepts are what objects exemplify."
Frege, Gottlob
F
"Analysis progresses from the familiar to the fundamental."
Frege, Gottlob
F
"Thoughts are independent of the thinker yet dependent on language."
Frege, Gottlob