Plato
428–348 BC · Ancient Greek
Sin is the disorder of the soul: to act unjustly is not merely to wrong another but to corrupt oneself, and the tyrant who does what he wishes is the most wretched of men.
The Greeks had a vocabulary for moral transgression before philosophy took the subject up. Hubris named the overreaching of human limit, and nemesis the divine correction which followed upon it. Plato inherits these notions and gives them a psychological interpretation. In the , Socrates maintains that it is worse to do injustice than to suffer it, and worse still to escape punishment for injustice than to undergo it. His interlocutors treat these propositions as absurd. Socrates argues that they follow from the condition of soul which the unjust act produces. The soul that does injustice is disordered, and punishment, by imposing order through pain, is remedial rather than merely retributive. To evade punishment is on this view to remain diseased, so that the man acquitted of a crime he committed has suffered the greater of the two available misfortunes.
The extends the analysis into a systematic account of the soul's parts. Reason, spirit, and appetite each have a proper function, and justice in the individual consists in the rule of reason over the other two. Injustice, which the later tradition will discuss under the name of sin, is the condition in which appetite or spirit usurps the ruling office. The tyrant is accordingly presented not as the man who has whatever he wants but as the man enslaved to his worst desires, unable to satisfy them, incapable of friendship or loyalty, and at war within himself. Whether the appearance of freedom which unlimited power confers can conceal so complete a servitude is the question on which the argument of the ninth book turns. Wrongdoing, so understood, injures the wrongdoer more than it injures the one he wrongs.
The discussion is not confined to psychology. In the and again in the tenth book of the , Plato tells myths of judgment after death in which souls are examined and marked by their transgressions, some being purged and others, judged incurable, set up as warnings to the rest. The tenth book of the treats impiety as an offense against the city as well as against the gods, and prescribes correction rather than vengeance for those whose denial of providence proceeds from ignorance. What is absent from these treatments is any doctrine of an inherited fault. The failures Plato describes are individual, and are traced to ignorance, to bad upbringing, or to the disorder of the appetites; they are not consequences of a fall which has corrupted human nature as such.
"Neither you, nor I, nor any man, would rather do than suffer injustice; for to do injustice is the greater evil of the two."
"And the tyrannical soul must be always poor and insatiable? ... And must not such a State and such a man be always full of fear?"
The Platonic diagnosis passes into the Christian tradition chiefly through Augustine, who takes over the account of disordered love while denying that philosophical discipline can supply the remedy, and through Aquinas, whose definition of sin as an act at variance with the order of reason preserves the Platonic form within a theology of the eternal law. Dante's arrangement of the sins according to the loves which produce them stands at a further remove but in the same line. The ordering of the soul's parts is treated under the ideas of Soul and of Virtue and Vice, the question of remedial as against retributive punishment under Punishment, and the identification of wrongdoing with injustice under Justice.
Key work: Republic