  We make nonsense of the argument if we suppose (with Robinson 1995, 36) that when Socrates introduces living as part of the function of soul, he has being alive in mind. The idea of being good (or bad) at being alive is, obviously, very odd, as is the idea of being alive well or badly. But there is no need to suppose that such ideas are involved here, or that Socrates passes from one sense of ‘living’ [to zên] to another. It is, after all, open to us to interpret what Socrates is saying in terms of a conception that integrates the things that Socrates attributes to the soul as functions, or as parts or aspects of its function, namely in terms of the conception of living a life, and not just any kind of life, but a distinctively human one. Caring for the right sorts of things in the right way, ruling or regulating oneself and (when appropriate) others, and deliberating about how to act are not just necessary, but central aspects of living a human life, and all of these things can be done well or badly. Depending on the condition of their soul, a person can be better or worse at doing these things. The just person, whose soul is in the best condition, is truly excellent at living a human life, in that they are excellent at doing the various things that are importantly involved in leading a distinctively human life. If this is along the right lines, we might be in a position to see Plato's answer to the question how it can be that one thing, the soul, accounts for the life of an organism as well as for its cognitive and intellectual functions, and is also the bearer of virtues or excellences. The answer suggested by the Book 1 argument is this. The way in which the human soul accounts for the life of a human organism is by accounting for the distinctively human life that the individual in question leads. But to account for such a life, it must also account for the cognitive and intellectual functions which guide and shape such a life. Moreover, the dramatic differences in how good people are at leading lives, and relatedly the dramatic differences in how well they exercise their cognitive and intellectual functions, are due to differences in the conditions of their souls, namely the presence or absence of the virtues of justice, wisdom, courage and temperance. This answer significantly clarifies (the relevant aspects of) the ordinary Greek notion of soul (see section 1).