It is vain to set against this the example of great philosophers without historical culture, as it is vain in the case of the necessity of historical knowledge for æsthetic criticism to bring forward instances of those who, although without any historical knowledge, have yet given far more true and more profound judgments upon art than the historically learned. If those judgments are true, then the critic supposed to be ignorant of history is not ignorant of it. He has somehow absorbed, scented in the air, divined with rapid perception those actual facts that were applicable to the given case. And, on the other hand, the so-called learned man will not be cultured, because his erudition is not lively and synthetic. The same happens in the case of those acute philosophers, who are said to be ignorant of the world and of history and of the thoughts of other philosophers. It cannot be denied that much or little history may be learned outside the usual course of teaching by manuals and by orderly mnemonic methods. But here, too, the exceptional mode of learning confirms the rule and does not obviate the usefulness for the majority of the customary modes of learning. On the other hand, if he who is said empirically to be without historical knowledge, but is not so in a given instance, should nevertheless prove really ignorant in other instances, where his unusual way of learning is not open to him, his philosophy also suffers. For this reason, those philosophers who are ignorant of history exhibit deficiencies that have often been deplored. They burst open doors already opened, they do not avail themselves of important results, they ignore grave difficulties and objections, they fail to probe certain problems sufficiently deeply, and show themselves too insecure and too superficial in others, and so on. Thus is the customary learning of history avenged upon them: and Herbert Spencer, who would never read Plato or Kant, is rejected, while Schelling and Hegel are again in the hands of students. [Sidenote: _Communication of history as changing of history._]