How We Do and What We Do
I don't know how I recognize faces I have seen many times before (though specialists may understand this to some extent). But who would insist that since that is the case, I have no grounds confidently thinking that I indeed do recognize such faces? Or who would say that until I do understand, I should restrain my confidence in my reasonably reliable ability to recognize faces? Gilbert Ryle referred to this distinction as knowing how versus knowing that . It's a distinction we ignore at our folly.