A promising place to start is the modal status of God’s existence. In Ip11, Spinoza claims that God necessarily exists. But what is it in virtue of which God necessarily exists? This might sound like an odd question. Once explanations reach a necessarily existing object, are there further in virtue of questions to be asked about that object’s existence? More generally, when we reach necessity, haven’t we reached the end of explanations?[14] Not always: mathematics is full of asymmetrical depe