Philosophy Quotes

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

43879 quotes

P
"The true domain of the mind is the relationship between things."
Poincaré, Henri
P
"The physicist is not merely a scientist; he is also a human being."
Poincaré, Henri
B
"The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth."
Bohr, Niels
B
"We cannot escape the fact that the world we know is constructed in order to be experienced by minds like ours."
Bohr, Niels
B
"Questions concerning scientific method and philosophical interpretation are inseparable."
Bohr, Niels
B
"A physicist is just an atom's way of looking at itself."
Bohr, Niels
B
"Every sentence I utter must be understood not as an affirmation, but as a question."
Bohr, Niels
B
"We cannot separate the observer from the observed."
Bohr, Niels
B
"In quantum mechanics, we are forced to reconsider what we mean by reality."
Bohr, Niels
B
"We must learn to think in new ways about the relationship between thought and reality."
Bohr, Niels
W
"In the end, we are all passengers on the same ship of civilization, and it behooves us to understand the course we are taking."
Weyl, Hermann
B
"The principle of excluded middle cannot simply be assumed; it must be earned through construction."
Brouwer, Luitzen Egbertus Jan
B
"The structure of mathematics mirrors the structure of the mind that creates it."
Brouwer, Luitzen Egbertus Jan
B
"Every infinite sequence is a meditation on the nature of potential and becoming."
Brouwer, Luitzen Egbertus Jan
B
"The principle of bivalence must be earned through rigorous proof, not assumed from on high."
Brouwer, Luitzen Egbertus Jan
B
"To embrace constructivism is to embrace responsibility for what we claim to know."
Brouwer, Luitzen Egbertus Jan
B
"To prove a theorem is to participate in the ongoing creation of meaning itself."
Brouwer, Luitzen Egbertus Jan
H
"The infinite! No other question has ever moved so profoundly the spirit of man."
Hilbert, David
H
"Mathematics does not just describe the world—it reveals its deepest structure."
Hilbert, David
H
"The consistency of our axioms is not guaranteed by the axioms themselves."
Hilbert, David
H
"The infinite cannot be contained in the finite, yet we try anyway."
Hilbert, David
H
"In the end, mathematics is a conversation between the human mind and the structure of reality."
Hilbert, David
H
"The infinite is not a number; it is a concept that transcends number."
Hilbert, David
H
"The structure of mathematics mirrors the structure of thought itself."
Hilbert, David
H
"In mathematics, as in life, meaning emerges from pattern and structure."
Hilbert, David
H
"In the end, all mathematical knowledge returns to first principles."
Hilbert, David
E
"God does not play dice with the universe."
Einstein, Albert
E
"The most incomprehensible thing about the world is that it is comprehensible."
Einstein, Albert
E
"The effort to understand the universe is one of the very few things that lifts human life above the level of farce."
Einstein, Albert
E
"One should as a rule respect public opinion in so far as is necessary to avoid starvation and to prevent one's children from being deserted."
Einstein, Albert