John Stuart Mill Quotes About Logic

Quotes about: Logic

• It must be granted that in every syllogism, considered as an argument to prove the conclusion, there is a petitio principii. When we say, All men are mortal Socrates is a man therefore Socrates is mortal; it is unanswerably urged by the adversaries of the syllogistic theory, that the proposition, Socrates is mortal.

  John Stuart Mill

  Men, Logic, Granted

  John Stuart Mill (1862). “A System of Logic, Ratiocinative and Inductive: Being a Connected View of the Principles of Evidence, and the Methods of Scientific Investigation”, p.207

• The maxim is, that whatever can be affirmed (or denied) of a class, may be affirmed (or denied) of everything included in the class. This axiom, supposed to be the basis of the syllogistic theory, is termed by logicians the dictum de omni et nullo.

  John Stuart Mill

  Science, Class, Nomenclature

  John Stuart Mill (1858). “A System of Logic, Ratiocinative and Inductive: Being a Connected View of the Principles of Evidence and the Methods of Scientific Investigation”, p.117

• Since reasoning , or inference, the principal subject of logic, is an operation which usually takes place by means of words , and in complicated cases can take place in no other way: those who have not a thorough insight into both the signification and purpose of words, will be under chances, amounting almost to certainty, of reasoning or inferring incorrectly.

  John Stuart Mill

  Mean, Way, Purpose

  John Stuart Mill (2016). “A System Of Logic, Ratiocinative And Inductive: Mill's Works”, p.20, VM eBooks

• facebook
• twitter
• googleplus
• email
• linkedin

• facebook
• twitter
• googleplus
• email
• linkedin