This chapter studies historicism. It is often said that philosophical views and, indeed, philosophy itself are historical phenomena. The historian, in considering the fact that somebody took a certain philosophical view as a historical fact, just treats this fact under one aspect; namely, that of how it fits into and can be explained out of history. But there is another aspect to the fact that he systematically disregards; namely, whether the view is true and whether it is warranted by the argument in its favour. This just reflects the fact that the historian does not himself take a stand on the philosophical issues. But it is a real aspect of the fact that somebody holds a certain view that the view is true or false, that one manages or fails to solve a problem, to answer a question, by advancing it. Ultimately, however, it is important to make sure that in one’s rejection of any kind of historicism one does not lose sight of the original insight which the historicist just pushed to an untenable extreme; namely, the insight that philosophical views, or philosophical judgements, are historical phenomena.