Karl Popper on Plato

“Socrates had refused to compromise his personal integrity. Plato, with all his uncompromising canvas-cleaning, was led along a path on which he compromised his integrity with every step he took. He was forced to combat free thought and the pursuit of truth. He was led to defend lying, political miracles, tabooistic superstition, the suppression of truth, and ultimately, brutal violence. …The lesson which we thus should learn from Plato is the exact opposite of what he tries to teach us. It is a lesson which must not be forgotten. Excellent as Plato's sociological diagnosis was, his own development proves that the therapy he recommended is worse than the evil he tried to combat.”

“Socrates had only one worthy successor, his old friend Antisthenes, the last of the Great Generation. Plato, his most gifted disciple, was soon to prove the least faithful. He betrayed Socrates, just as his uncles had done. These, besides betraying Socrates, had also tried to implicate him in their terrorist acts, but they did not succeed, since he resisted. Plato tried to implicate Socrates in his grandiose attempt to construct the theory of the arrested society ; and he had no difficulty in succeeding, for Socrates was dead.I know of course that this judgement will seem outrageously harsh, even to those who arc critical of Plato . But if we look upon the Apology and the Crito as Socrates' last will, and if we compare these testaments of his old age with Plato's testament, the Laws, then it is difficult to judge otherwise. Socrates had been condemned, but his death was not intended by the initiators of the trial. Plato's Laws remedy this lack of intention. Here he elaborates coolly and carefully the theory of inquisition. Free thought, criticism of political institutions, teaching new ideas to the young, attempts to introduce new religious practices or even opinions, are all pronounced capital crimes. In Plato's state, Socrates might have never been given the opportunity of defending himself publicly ; he would have been handed over to the secret Nocturnal Council for the purpose of 'attending' to his diseased soul, and finally for punishing it.I cannot doubt the fact of Plato's betrayal, nor that his use of Socrates as the main speaker of the Republic was the most successful attempt to implicate him. But it is another question whether this attempt was conscious.”