I hope I will be forgiven for abusing the term “skepticism” here — for what I have in mind is not a perfectly innocuous “claims require evidence” epistemic prudence, but rather Cartesian skepticism.
According to the Cartesian skeptic, one can be perfectly certain about one’s own mental contents and yet also be in total doubt about what really corresponds to those mental contents. Hence she needs an argument that will justify her belief that there is any external reality at all, and that at least some of her mental contents can correspond to it.
There are many responses to Cartesian skepticism, and here I want to pick up on one strand in the pragmatist tradition that, on my view, cuts deepest into what is wrong with Cartesian skepticism.
I think that one cannot talk, in any intelligible sense, about justification in the first place without also committing oneself to a belief in other minds with whom one shares a world. (Not that I like that way of putting it — “a belief in other minds” is a much too intellectualistic interpretation of the myriad ways in which we experience the sentience of nonhuman animals and the sentience-and-sapience of other human animals.)
