Frege’s contribution to philosophical logic has been so overwhelming that little if any attention seems to have been paid to his remarks on epistemology. It is of course true that he never published a work exclusively concerned with epistemological issues. But his paper “The Thought” contains extensive treatment of matters concerning the theory of knowledge. Moreover the importance which he attributed to some of his remarks on specific epistemological problems can be gauged by the frequency with which he repeats them (...) throughout his writings. The introductions to the Foundations of Arithmetic and to the Basic Laws of Arithmetic contain much the same biting sarcastic onslaught upon idealism and psychologism. Similar points are repeated in his review of Husserl’s Philosophie der Arithmetik, in his paper “Negation”, and in other articles. His concern with epistemology is wholly determined by the bearing which it has upon philosophical logic. This is largely negative. Apart from the paper “The Thought” his remarks go only so far as is necessary in order for him to vindicate his doctrine of the purity of logic. Indeed even in that paper his motives are similar, but his treatment of the issues involved is more extensive and his own incompletely developed epistemological position shows through more clearly than elsewhere. An examination of his views is of value from two points of view, firstly it is of some intrinsic interest, secondly his position takes him to the threshold of Wittgenstein’s argument against the possibility of a private language. Moreover, as I shall try to show, the substance of his view is frequently the target of Wittgenstein’s critical discussion. (shrink)