Plato Apology 30

[30] And if any of you argues the point, and says he does care, I shall not let him go at once, nor shall I go away, but I shall question and examine and cross-examine him, and if I find that he does not possess virtue, but says he does, I shall rebuke him for scorning 30a the things that are of most importance and caring more for what is of less worth. This I shall do to whomever I meet, young and old, foreigner and citizen, but most to the citizens, inasmuch as you are more nearly related to me. For know that the god commands me to do this, and I believe that no greater good ever came to pass in the city than my service to the god. For I go about doing nothing else than urging you, young and old, not to care for your persons or your property 30b more than for the perfection of your souls, or even so much; and I tell you that virtue does not come from money, but from virtue comes money and all other good things to man, both to the individual and to the state. If by saying these things I corrupt the youth, these things must be injurious; but if anyone asserts that I say other things than these, he says what is untrue. Therefore I say to you, men of Athens , either do as Anytus tells you, or not, and either acquit me, or not, knowing that I shall not change my conduct even if I am 30c to die many times over.
  Do not make a disturbance, men of Athens ; continue to do what I asked of you, not to interrupt my speech by disturbances, but to hear me; and I believe you will profit by hearing. Now I am going to say some things to you at which you will perhaps cry out; but do not do so by any means. For know that if you kill me, I being such a man as I say I am, you will not injure me so much as yourselves; for neither Meletus nor Anytus could injure me; 30d that would be impossible, for I believe it is not God’s will that a better man be injured by a worse. He might, however, perhaps kill me or banish me or disfranchise me; and perhaps he thinks he would thus inflict great injuries upon me, and others may think so, but I do not; I think he does himself a much greater injury by doing what he is doing now—killing a man unjustly. And so, men of Athens , I am now making my defence not for my own sake, as one might imagine, but far more for yours, that you may not by condemning me err in your treatment of the gift the God gave you. 30e For if you put me to death, you will not easily find another, who, to use a rather absurd figure, attaches himself to the city as a gadfly to a horse, which, though large and well bred, is sluggish on account of his size and needs to be aroused by stinging. I think the god fastened me upon the city in some such capacity, and I go about arousing, 31a and urging and reproaching each one of you, constantly alighting upon you everywhere the whole day long.