M. Tullius Cicero Pro L. Flacco 9

[9]
  Will you then listen to others as witnesses on those points, respecting which you yourselves ought rather to bear witness to others? And what witnesses are they? In the first place, I will say that they are Greeks, (that is the case of them all.) Not that I, for my own part, would be more inclined than others to refuse credit to that nation; for if ever there was any one of our countrymen not averse to that race of men, and proving himself so by zeal and good-will, I think that I am that man, and that I was so even more when I had more leisure; but there are in that body many virtuous, many learned, many modest men, and they have not been brought hither to this trial. There are also many impudent, illiterate, worthless persons, and those I see here, impelled by various motives. But I say this of the whole race of Greeks; I allow them learning, I allow them a knowledge of many arts; I do not deny them wit in conversation, acuteness of talents, and fluency in speaking; even if they claim praise for other sorts of ability, I will not make any objection; but a scrupulous regard to truth in giving their evidence is not a virtue that that nation has ever cultivated; they are utterly ignorant what is the meaning of that quality, they know nothing of its authority or of its weight.