 Spinoza explains the necessity of God’s existence by appealing to God’s nature. This may sound like a non-answer, but it is not. Spinoza is not claiming that there are no explanatory grounds for God’s existence; he is claiming that facts about God’s nature explain the modality of God’s existence. What about God’s nature explains God’s existence? In Ip7 and Ip11, Spinoza appeals to an involvement relation between the concept of God’s essence and the concept of God’s existence. That is, God exists in virtue of the fact that the concept of God involves the concept of existence. Spinoza also thinks that the conceptual involvement relation between God and existence explains the fact that God necessarily exists. In Ip19d, Spinoza writes,