Plato's Argument For A Just Life Plato's argument for the benefits of a just life is intrinsically linked to his definition of good and its relation to people's desires. He begins by showing that when the objective of a desire is simple (e.g. quenching a thirst), the desire must be correspondingly simple. Since thirst is a simple desire, the man's objective must also be simplistic and should we assign an adjective to his objective, we would falsely complicate it. In addition, Plato believes that we would be seriously erring if we assign a value of good to an desire. In common use, the adjective good would