At least since Sachs' well-known essay, readers of Plato's Republic have worried that there is a gap between the challenge posed to Socrates--to show that it is always in one's interest to act justly--and his response--to show that it is always in one's interest to have a just soul. The most popular response has been that Socrates fills this gap in Books Five through Seven by supposing that knowledge of the Forms motivates those with just souls to act justly. I (...) offer some complaints about this gap-filling strategy and offer an alternative account, according to which there was never a gap. On my account, Socrates assumes that no one can have a just soul unless they have been raised well and that anyone who is raised well will act justly. On this view, the account of moral education in Books Two through Four is the key to understanding the connection between psychological and practical justice. I argue that this account makes better sense of what the Republic says, and that it attributes to Plato a more plausible moral psychology. (shrink)