Cicero: “If you don't see the virtue of friendship and harmony, you may learn it by observing the effects of quarrels and feuds.”

Accordingly, in encountering danger we should do as doctors do in their practice: in light cases of illness they give mild treatment; in cases of dangerous sickness they are compelled to apply hazardous and even desperate remedies.

For we contend, for example, with a fellow-citizen in one way, if he is a personal enemy, in another, if he is a rival: with the rival it is a struggle for office and position, with the enemy for life and honour.

But for the most part, people are led to wrong-doing in order to secure some personal end; in this vice, avarice is generally the controlling motive.

But while they steer clear of the one kind of injustice, they fall into the other: they are traitors to social life, for they contribute to it none of their interest, none of their effort, none of their means.