Similar words are applied by the Persian mystic poet to the Divine being when the questioning spirit is stirred within him:--'If because I do evil, Thou punishest me by evil, what is the difference between Thee and me ?' In this both Plato and Kheyam rise above the level of many Christian ( ?) theologians.

The first definition of justice easily passes into the second; for the simple words 'to speak the truth and pay your debts' is substituted the more abstract 'to do good to your friends and harm to your enemies.' Either of these explanations gives a sufficient rule of life for plain men, but they both fall short of the precision of philosophy.

We may note in passing the antiquity of casuistry, which not only arises out of the conflict of established principles in particular cases, but also out of the effort to attain them, and is prior as well as posterior to our fundamental notions of morality.

The 'interrogation' of moral ideas; the appeal to the authority of Homer; the conclusion that the maxim, 'Do good to your friends and harm to your enemies,' being erroneous, could not have been the word of any great man, are all of them very characteristic of the Platonic Socrates.
...Here Thrasymachus, who has made several attempts to interrupt, but has hitherto been kept in order by the company, takes advantage of a pause and rushes into the arena, beginning, like a savage animal, with a roar.

'Socrates,' he says, 'what folly is this ?--Why do you agree to be vanquished by one another in a pretended argument ?' He then prohibits all the ordinary definitions of justice; to which Socrates replies that he cannot tell how many twelve is, if he is forbidden to say 2 x 6, or 3 x 4, or 6 x 2, or 4 x 3.