God's sovereignty also extends to criteria of identity. “Species” (kinds or natures) are the ways we classify things. But our classifications depend on our needs and interests, and the character of the world we live in. Hence, in determining every feature of the spatio-temporal world, God has determined how things will be classified, that is, what counts as a “species” or kind. Since a thing's criteria of identity are determined by its nature or kind, God is their ultimate ground. In short, laws