This book intervenes in the very lively debate regarding how Spinoza can think that we live in a world populated by one being: God. Emanuele Costa deploys a series of innovative tools to explain what constitutes an "individual being" (e.g., a chair, a cat, a human being) and what kind of metaphysical depth we can attribute to this kind of notion. He also suggests that Spinoza can mobilize these metaphysical resources to invite his readers to take seriously a new kind of ethical thinking, elevating themselves above their immediate surroundings and individualism.