How can you prove whether at this moment we are sleeping, and all our thoughts are a dream; or whether we are awake, and talking to one another in the waking state?
Plato... our purpose in founding our state was not to promote the happiness of a single class, but, so far as possible, of the whole community. Our idea was that we were most likely to justice in such a community, and so be able to decide the question we are trying to answer. We are therefore at the moment trying to construct what we think is a happy community by securing the happiness not of a select minority, but of a whole.
Plato