[T]here is a dispute among those who agree that the most choiceworthy life is that accompanied by virtue as to whether the political and active way of life is choiceworthy, or rather that which is divorced from all external things – that involving some sort of study, for example – which some assert is the only philosophic way of life. For it is evident that these two ways of life are the ones intentionally chosen by those human beings who are most ambitious with a view to virtue, both in former times and at present; the two I mean are the political and the philosophic.