That individual philosophical concepts are not something arbitrary, something growing up autonomously, but on the contrary grow up connected and related to one another; that, however suddenly and arbitrarily they appear to emerge in the history of thought, they nonetheless belong just as much to a system as do the members of the fauna of a continent: that fact is in the end also shown in the fact that the most diverse philosophers unfailingly fill out again and again a certain basic scheme of possible philosophies.
