Retortion is the philosophical procedure whereby one seeks to establish a thesis by uncovering a performative inconsistency in anyone who attempts to deny it. If, for example, I were to assert that there are no assertions, the very act of making this assertion would show it to be false: the performance of assertion is 'inconsistent' with the truth of the content asserted. (The scare quotes signal that this 'inconsistency' is not strictly logical since strictly logical inconsistency is a relation that holds between or among propositions. A speech act, however, is not a proposition, though its content is.)
Can a similar retorsive argument be mounted against Zeno's denials of motion and plurality?
The retorsive argument might proceed as follows. For Zeno to convey his Parmenidean thoughts to us he must wag his tongue and draw diagrams in the Eleatic sand. Does he thereby prove the actuality and thus the possibility of motion and fall into performative inconsistency? The answer depends on how we understand the purport of the Zenonian argumentation.
A. If Zeno's arguments are taken to show that motion conceived in a certain way does not exist, then the wagging of the tongue, etc. is 'consistent' with the proposition that motion conceived in that way does not exist, and the retorsive argument fails. For example, suppose one maintains that for a particle P to be in motion (relative to a reference-frame) is for P to occupy continuum-many different positions at continuum-many different times (relative to that reference-frame). This popular 'At-At' theory of motion requires the denseness of physical time and physical space. Now if it turns out that motion so conceived does not exist, it may still be the case that motion conceived in some other way does exist, and that Zeno's tongue-wagging and diagram-drawing is motion under that competing conception. The competing conception might, for example, deny the denseness of space or of time, or both.
B. If Zeno's arguments are taken to show that motion no matter how it is conceived does not exist, and is a mere illusion bare of all reality, then the retorsive argument refutes him. For then the moving of his tongue is 'inconsistent' with the truth of 'Nothing moves.' By moving his tongue, pulling his beard, flaring his nostrils, adjusting his toga, and pounding the lectern, he demonstrates the empirical reality of motion, a reality that is prior to, and neutral in respect of, all conceptions of this reality.
Although the retorsive argument works against a Zeno so interpreted, this interpretation is uncharitable in the extreme. Read charitably, Zeno is not claiming that motion and plurality are mere subjective illusions, but rather that they are something like Leibnizian well-founded phenomena (phaenomena bene fundata) or intersubjectively valid Kantian Erscheinungen. They are not mere illusions, but they are not ultimately real either.
C. If Zeno's arguments are taken to show that motion and plurality are intersubjectively valid appearances, but not ultimately real, then they are being taken to show that motion conceived in a certain way, as belonging to ultimate reality, does not exist. This view of motion seems 'consistent' with the motions required to convey Zenonian argument.
My verdict, then, is that retortion does not refute a Zeno charitably interpreted.
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