John Locke's sense) that comes into existence when the brain gives rise to certain developed psychological capacities. If either of these views is correct, Marquis's argument will fail; for the embryo (even the early "fetus", lacking the relevant psychological capacities) would not "itself" have a future of value, but would merely have the potential to give rise to a "different" entity, an embodied mind or a person, that "would" have a future of value. The success of Marquis's argument thus depends on one's favored account of personal identity.