Stack topper. Here are four addenda to what I say in the Substack entry.
1) A skeptic is an inquirer, not a denier. Too many confuse doubt, the engine of inquiry, with denial. If I doubt that such-and-such, I neither affirm it nor deny it.
2) Is doubting whether a proposition is true the same as suspending judgment as to its truth-value? A subtle question. I think we should say that it is not. For if doubt is the engine of inquiry, then we doubt in order to attain such truth as we are able to attain. But if one suspends judgment as to the truth-value of some proposition P — if one 'suspends P' for short — one may do so with no intention of trying to determine whether P is true. For example, I suspend judgment, take no doxastic stance, on the question whether the number of registered Democrats in Maricopa County is odd or even. I don't know, I don't care, and I will do nothing to find out. Suspension, not doubt.
3) Another subtle difference is that between suspension (withholding of assent) or Pyrrhonist epoché in the broad sense, which is related to but quite different from Husserlian epoché, and Pyrrhonist epoché in the narrow sense. A standard treatment of the former is along the following lines (Wikipedia):
The Pyrrhonists developed the concept of "epoché" to describe the state where all judgments about non-evident matters are suspended to induce a state of ataraxia (freedom from worry and anxiety). The Pyrrhonist philosopher Sextus Empiricus gives this definition: "Epoché is a state of the intellect on account of which we neither deny nor affirm anything." This concept is similarly employed in Academic Skepticism but without the objective of ataraxia.
Benson Mates adds a nuance by distinguishing between withholding assent with respect to truth-value and withholding assent with respect to sense (Frege's Sinn). I endorse the distinction. Consider the proposition expressed by the standard Trinitarian formula, 'There is one God in three divine persons.' (My example.) What mental attitudes can we take up with respect to this proposition? I count five: Affirm, Deny, Doubt, Suspendtv (withhold assent with respect to truth-value), Suspends (withhold assent with respect to the question whether the proposition has a determinate sense or meaning). For example, one might maintain that the Trinitarian formula has or makes no sense, which is to say that no definite proposition is expressed by the verbal utterance or inscription. If the formula makes no sense, then it does not express a proposition, a proposition being a sense, whence it follows that the formula cannot have a truth-value.
4) A solubility skeptic with respect to the central problems of philosophy is not the same as a problem skeptic. I am not a problem skeptic. I don't doubt that the central problems are genuine, pace the later Wittgenstein. The central problems are genuine, not pseudo, but I doubt whether they are soluble by us. So doubting, I conjecture that they are not soluble by us as the best explanation of why they haven't been solved.
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