If every reader of this blog owns a computer, it doesn’t follow that there is some one computer that every reader of this blog owns. To think otherwise is to commit what is known as a quantifier shift fallacy. A reader asks me to comment on the following passage from the second edition of Harry Gensler’s Introduction to Logic:
Some great minds have committed this quantifier shift fallacy. Aristotle argued, “Every agent acts for an end, so there must be some (one) end for which every agent acts.” St Thomas Aquinas argued, “If everything at some time fails to exist, then there must be some (one) time at which everything fails to exist.” And John Locke argued, “Everything is caused by something, so there must be some (one) thing that caused everything.” (p. 220)
Such claims about Aristotle, Aquinas, and Locke are often made. Are they true? The answer, in my view, is that they are not true – certainly not in the cases of Aristotle and Aquinas, and arguably not in the case of Locke either.
Such claims about Aristotle, Aquinas, and Locke are often made. Are they true? The answer, in my view, is that they are not true – certainly not in the cases of Aristotle and Aquinas, and arguably not in the case of Locke either.