Strabo Geography 7.3.8

[8] Those, however, who lived before our times, and particularly those who lived near the time of Homer, were—and among the Greeks were assumed to be—some such people as Homer describes. And see what Herodotus says concerning that king of the Scythians against whom Dareius made his expedition, and the message which the king sent back to him. ¹ See also what Chrysippus ² says concerning the kings of the Bosporus, the house of Leuco. ³ And not only the Persian letters ⁴ are full of references to that straightforwardness of which I am speaking but also the memoirs written by the Egyptians, Babylonians, and Indians. And it was on this account that Anacharsis, ⁵ Abaris, ⁶ and other men of the sort were in fair repute among the Greeks, because they displayed a nature characterized by complacency, frugality, and justice. But why should I speak of the men of olden times? For when Alexander, the son of Philip, on his expedition against the Thracians beyond the Haemus, ⁷ invaded the country of the Triballians ⁸ and saw that it extended as far as the Ister and the island of Peuce ⁹ in the Ister, and that the parts on the far side were held by the Getae, he went as far as that, ¹⁰ it is said, but could not disembark upon the island because of scarcity of boats (for Syrmus, the king of the Triballi had taken refuge there and resisted his attempts); he did, however, cross over to the country of the Getae, took their city, and returned with all speed to his home-land, after receiving gifts from the tribes in question and from Syrmus. And Ptolemaeus, ¹¹ the son of Lagus, ¹² says that on this expedition the Celti who lived about the Adriatic joined Alexander for the sake of establishing friendship and hospitality, and that the king received them kindly and asked them when drinking what it was that they most feared, thinking they would say himself, but that they replied they feared no one, unless it were that Heaven might fall on them, although indeed they added that they put above everything else the friendship of such a man as he. And the following are signs of the straightforwardness of the barbarians: first, the fact that Syrmus refused to consent to the debarkation upon the island and yet sent gifts and made a compact of friendship; and, secondly, that the Celti said that they feared no one, and yet valued above everything else the friendship of great men. Again, Dromichaetes was king of the Getae in the time of the successors of Alexander. Now he, when he captured Lysimachus ¹³ alive, who had made an expedition against him, first pointed out the poverty both of himself and of his tribe and likewise their independence of others, and then bade him not to carry on war with people of that sort but rather to deal with them as friends; and after saying this he first entertained him as a guest, and made a compact of friendship, and then released him. Moreover, Plato in his Republic thinks that those who would have a well-governed city should flee as far as possible from the sea, as being a thing that teaches wickedness, and should not live near it. ¹⁴