““If philosophy had the power to establish incontrovertible truths, immune to doubt, and if philosophers were as a rule wholly disinterested practitioners of their art, then it might be possible to speak of progress in philosophy. In fact, however, the philosophical tendencies and presuppositions of any age are, to a very great degree, determined by the prevailing cultural mood or by the ideological premises generally approved of my the educated classes. As often as not, the history of philosophy has been a history of prejudices masquerading as principles, and so merely a history of fashion. It is as possible today to be an intellectually scrupulous Platonist as it was more than two thousand years ago; it is simply not in vogue.””