 As Berlin showed, negative and positive liberty are not merely two distinct kinds of liberty; they can be seen as rival, incompatible interpretations of a single political ideal. Since few people claim to be against liberty, the way this term is interpreted and defined can have important political implications. Political  liberalism  tends to presuppose a negative definition of liberty: liberals generally claim that if one favors individual liberty one should place strong limitations on the activities of the state. Critics of liberalism often contest this implication by contesting the negative definition of liberty: they argue that the pursuit of liberty understood as self-realization or as self-determination (whether of the individual or of the collectivity) can require state intervention of a kind not normally allowed by liberals.