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Frederick Copleston on Doubt and Skepticism

A History of Philosophy: Volume II: Medieval Philosophy, (Continuum: 2003, orig. 1950) p. 53

Again, everyone who doubts knows that he is doubting, so that he is certain of this truth at least, namely the fact that he doubts. Thus every one who doubts whether there is such a thing as truth, knows at least one truth, so that his very capacity to doubt should convince him that there is such a thing as truth.