Philosophers who embraced panentheism have included Thomas Hill Green (1839–1882), James Ward (1843–1925), Andrew Seth Pringle-Pattison (1856–1931) and Samuel Alexander (1859–1938). Beginning in the 1940s, Hartshorne examined numerous conceptions of God. He reviewed and discarded pantheism, deism, and pandeism in favor of panentheism, finding that such a "doctrine contains all of deism and pandeism except their arbitrary negations". Hartshorne formulated God as a being who could become "more perfect": He has absolute perfection in categories for which absolute perfection is possible, and relative perfection (i. e., is superior to all others) in categories for which perfection cannot be precisely determined.