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Quotation from A System of Logic, Book III: Of Induction by John Stuart Mill
“The cause, then, philosophically speaking, is the sum total of the conditions, positive and negative taken together”
A System of Logic, Book III: Of Induction, Book III, Ch. V, § 3 (8th ed. (New York: Harper, 1882); Project Gutenberg text)

Mill's definition of cause, after showing that ordinary speech singles out one condition among many.
Citation: "The cause, then, philosophically speaking, is the sum total of the conditions, positive and negative taken together" — John Stuart Mill, A System of Logic, Book III: Of Induction, Book III, Ch. V, § 3 (8th ed. (New York: Harper, 1882); Project Gutenberg text). (id mill-system-of-logic-book-iii-q5)
Portrait: John Stuart Mill by London Stereoscopic Company, c1870, London Stereoscopic Company, Public domain.
