Therefore, I repeat what I said before: A person of great power outdoes everyone else. Consider him if you want to figure out how much more advantageous it is for the individual to be just rather than unjust. You’ll understand this most easily if you turn your thoughts to the most complete injustice, the one that makes the doer of injustice happiest and the sufferers of it, who are unwilling to do injustice, most wretched. This is tyranny, which by fraud and force takes away the property of others, whether sacred or profane, public or private, not little by little, but all at once.
If someone commits only one part of injustice and is caught, he’s punished and greatly reproached - such partly unjust people are called temple-robbers, kidnappers, housebreakers, robbers, and thieves when they commit these crimes.
But when someone, in addition to appropriating their possessions, kidnaps and enslaves the citizens as well, instead of these shameful names he is called happy and blessed, not only by the citizens themselves, but by all who learn that he has done the whole of injustice. Those who reproach injustice do so because they are afraid not of doing it but of suffering it.By Thrasymachus to Socrates (The Republic by Plato)