Logic

Bertrand Russell

Philosophy

Analytic philosophy

1872–1970

"When the intensity of emotional conviction subsides, a man who is in the habit of reasoning will search for logical grounds in favour of the belief which he finds in himself."

Georg Wilhelm Friedrich Hegel

Philosophy

Idealism

1770–1831

"To be aware of limitations is already to be beyond them."

🇬🇧Alfred North Whitehead

Philosophy

1861–1947

"Men can be provincial in time, as well as in place."

Zeno of Citium

Philosophy

stoicism

-333–-262

"No one entrusts a secret to a drunken man; but one will entrust a secret to a good man; therefore, the good man will not get drunk."

🇬🇧Derek Parfit

Ethics

1942–2017

"To be a person, a being must be self-conscious, aware of its identity and its continued existence over time."

🇺🇸Charles Sanders Peirce

Mathematics

pragmatism

1839–1914

"Let us not pretend to doubt in philosophy what we do not doubt in our hearts."

🇬🇧Alan Turing

Science

1912–1954

"We can only see a short distance ahead, but we can see plenty there that needs to be done."

🇨🇭Jean Piaget

Philosophy

1896–1980

"The essential functions of the mind consist in understanding and in inventing, in other words, in building up structures by structuring reality."

William Stanley Jevons

Economics

1835–1882

"In this work I have attempted to treat economy as a calculus of pleasure and pain, and have sketched out,almost irrespective of previous opinions, the form which the science,as it seems to me, must ultimately take."

🇬🇧Duns Scotus

Religion

1266–1308

"Stanford Encyclopedia of Philosophy: "John Duns Scotus"

🇺🇸Alfred Tarski

Mathematics

Analytic philosophy

1901–1983

"Tarski's Semantic Theory on the Internet Encyclopedia of Philosophy."

🇬🇧Michael Dummett

Philosophy

Analytic philosophy

1925–2011

"Such were the lucidity of exposition and his mastery of the topic that it seems possible that, had he ever published it, the political theory of Britain would have been significantly different."

Leopold Kronecker

Mathematics

1823–1891

"God made the integers, all the rest is the work of man."

Galen

Medicine

"The fact is that those who are enslaved to their sects are not merely devoid of all sound knowledge, but they will not even stop to learn!"

Georg Cantor

Mathematics

1845–1918

"I realize that in this undertaking I place myself in a certain opposition to views widely held concerning the mathematical infinite and to opinions frequently defended on the nature of numbers."

Augustus De Morgan

Mathematics

1806–1871

"A Budget of Paradoxes reprinted, with the author's additions from the Athenæum journal"

🇺🇸Saul Kripke

Philosophy

1940–2022

"It really is a nice theory. The only defect I think it has is probably common to all philosophical theories. It's wrong."

🇺🇸Raymond Smullyan

Philosophy

1919–2017

"I believe that either Jupiter has life or it doesn't. But I neither believe that it does, nor do I believe that it doesn't."

🇬🇧Frank P. Ramsey

Mathematics

1903–1930

"lthough my attempted reconstruction of the view of Whitehead and Russell overcomes, I think, many of the difficulties, it is impossible to regard it as altogether satisfactory."

Mozi

social philosophy

-469–-390

"Whoever criticizes others must have something to replace them. Criticism without suggestion is like trying to stop flood with flood and put out fire with fire. It will surely be without worth."

"...potted thinking is easily accepted, is concentrated in form, and has lost the vitamins essential to mental nourishment."

🇵🇱Kazimierz Ajdukiewicz

Philosophy

1890–1963

"By spreading logical culture, we prepare the foundation for a scientific world-view and by doing this we enable development."