Dante's Divine Comedy describes his journey through the spheres of heaven. In Paradiso, Dante ascends through nine celestial spheres with Beatrice, representing increasing perfection. Each sphere corresponds to a virtue and contains souls exemplifying that virtue. The spheres are nested within each other according to medieval cosmology, with the earth at the center and God in the Empyrean, the highest heaven beyond the moving spheres. In the Empyrean, Dante experiences a vision of God as a blinding light.