 This account also explains why Spinoza is attracted to his modal transfer principle in the first place. Recall that the modal transfer principle states that necessity transfers along following-from chains whose nodes include at least one necessarily existing thing. We saw earlier that Spinoza’s following-from relation is a causal relation and that causal relations are conceptual relations for Spinoza. But we just saw that necessity is also partly a function of conceptual relations. Thus necessity transfers along following-from chains because both necessity and following-from are grounded in the same relations of conceptual involvement. The underlying conceptual nature of modality, causation, and following-from explains why Spinoza’s modal transfer principle works.