What is conventionally called ‘philosophy’ consists of two very different elements. On the one hand, there are questions which are scientific or logical; these are amenable to methods as to which there is general agreement. On the other hand, there are questions of passionate interest to large numbers of people, as to which there is no solid evidence either way. … A ‘philosophy’, in a very usual sense of the word, is an organic whole of such extrarational decisions. It is in regard to ‘philosophy’ in this sense that Marx’s contention is largely true.

Bertrand Russell, History of Western Philosop…, loc. 2852