“The laws of thought are natural laws with which we have no power to interfere, and which are of course not to be in any way confused with the artificial laws of a country, which are invented by men and can be altered by them. Every science is occupied in detecting and describing the natural laws which are inflexibly observed by the objects treated in the Science.”

Introduction, Lesson I: Definition and Sphere of the Science.
Elementary Lessons on Logic (1870)

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William Stanley Jevons 69
English economist and logician 1835–1882

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