Causalidade e necessidade na ontologia de Espinosa

This paper intends to reconstruct the demonstrative chain presented in the first book of Spinoza´s Ethics in the perspective of his conception of causality. Present since the first definition of the work (the causa sui), the notion of cause will determinate all of Spinoza´s ontology, leading to the complete refusal of contingency and consequently to the affirmation of reality as absolutely necessary.