Plato, from Apology of Socrates
From this investigation, then, O Athenians! many enmities have arisen against me, and those the most grievous and severe, so that many calumnies have sprung from them, and among them this appellation of being wise; for those who are from time to time present think that I am wise in those things, with respect to which I expose the ignorance of others. The god, however, O Athenians! appears to be really wise, and to mean this by his oracle: that human wisdom is worth little or nothing; and it is clear that he did not say this to Socrates, but made use of my name, putting me forward as an example, as if he had said, that man is the wisest among you, who, like Socrates, knows that he is in reality worth nothing with respect to wisdom. Still, therefore, I go about and search and inquire into these things, in obedience to the god, both among citizens and strangers, if I think any one of them is wise; and when he appears to me not to be so, I take the part of the god, and show that he is not wise. And, in consequence of this occupation, I have no leisure to attend in any considerable degree to the affairs of the state or my own; but I am in the greatest poverty through my devotion to the service of the god.
In addition to this, young men, who have much leisure and belong to the wealthiest families, following me of their own accord, take great delight in hearing men put to the test, and often imitate me, and themselves attempt to put others to the test; and then, I think, they find a great abundance of men who fancy they know something, although they know little or nothing. Hence those who are put to the test by them are angry with me, and not with them, and say that "there is one Socrates, a most pestilent fellow, who corrupts the youth." And when any one asks them by doing or teaching what, they have nothing to say, for they do not know; but, that they may not seem to be at a loss, they say such things as are ready at hand against all philosophers; "that he searches into things in heaven and things under the earth, that he does not believe there are gods, and that he makes the worse appear the better reason." For they would not, I think, be willing to tell the truth that they have been detected in pretending to possess knowledge, whereas they know nothing. Therefore, I think, being ambitions and vehement and numerous, and speaking systematically and persuasively about me, they have filled your ears, for a long time and diligently calumniating me. From among these, Melitus, Anytus and Lycon have attacked me; Melitus being angry on account of the poets, Anytus on account of the artisans and politicians, and Lycon on account of the rhetoricians. So that, as I said in the beginning, I should wonder if I were able in so short a time to remove from your minds a calumny that has prevailed so long. This, O Athenians! is the truth; and I speak it without concealing or disguising anything from you, much or little; though I very well know that by so doing I shall expose myself to odium. This, however, is a proof that I speak the truth, and that this is the nature of the calumny against me, and that these are its causes. And if you will investigate the matter, either now or hereafter, you will find it to be so.