The case, as set forth first by Glaukon, next by Adeimantus, making themselves advocates of Thrasymachus--is as follows. "To do injustice, is by nature good: to suffer injustice is by nature evil: but the last is greater as an evil, than the first as a good: so that when men have tasted of both, they find it advantageous to agree with each other, that none shall either do or suffer injustice. These agreements are embodied in laws; and what is prescribed by the law is called lawful and just. Here you have the generation and essence of justice, which is intermediate between what is best and what is worst: that is, between the power of committing injustice with impunity, and the liability to suffer injustice without protection or redress. Men acquiesce in such compromise, not as in itself good, but because they are too weak to commit injustice safely. For if any man were strong enough to do so, and had the dispositions of a man, he would not make such a compromise with any one: it would be madness in him to do so.[31] [Footnote 31: Plato, Republic, ii. pp. 358-359.] "That men are just, only because they are too weak to be unjust, will appear if we imagine any of them, either the just or the unjust, armed with full power and impunity, such as would be conferred by the ring of Gyges, which rendered the wearer invisible at pleasure. If the just man could become thus privileged, he would act in the same manner as the unjust: his temper would never be adamantine enough to resist the temptations which naturally prompt every man to unlimited satisfaction of his desires. Such temptations are now counteracted by the force of law and opinion; but if these sanctions were nullified, every man, just or unjust, would seize every thing that he desired, without regard to others. When he is just, he is so not willingly, but by compulsion. He chooses that course not as being the best for him absolutely, but as the best which his circumstances will permit. [Side-note: Comparison of the happiness of the just man derived from his justice alone, when others are unjust to him with that of the unjust man under parallel circumstances.]