But these long comfortable words that save modern people the toil of reasoning have one particular aspect in which they are especially ruinous and confusing. This difficulty occurs when the same long word is used in different connections to mean quite different things. Thus, to take a well-known instance, the word “idealist” has one meaning as a piece of philosophy and quite another as a piece of moral rhetoric. In the same way the scientific materialists have had just reason to complain of people mixing up “materialist” as a term of cosmology with “materialist” as a moral taunt. So, to take a cheaper instance, the man who hates “progressives” in London always calls himself a “progressive” in South Africa.