Appearing in English for the first time, this book comprises two of Ortega's most important works, ?Qu? es conocimiento? and the essay "Ideas y creencias." This is Ortega's attempt to systematically present the foundations of his metaphysics of human life and, on that basis, to provide a radical philosophical account of knowledge. In so doing, he criticizes idealism and overcomes it. Accordingly, this book goes well beyond a treatise on epistemology;...