Christoph Sebastian Widdau makes an innovative contribution to Cassirer research, Leibniz studies, and the foundation of human rights with his book. He sheds a new light on the "nature" in natural law, the cultural significance of the individual, and the pluralism of political orders from an intellectual and philosophical perspective. In "Cassirer's Leibniz," Widdau demonstrates that human rights are not an arbitrary addition to culture, but rather are constitutive of culture itself.