Τειρεσίης

From LSJ

ἔστι γὰρ ὁ φίλος ἄλλος αὐτός → a friend, you see, is another self

Source

English (Autenrieth)

Tiresias, the blind seer of Thebes. Of all the shades in the nether world Tiresias alone retained his mental faculties unimpaired. Od. 10.524, , Od. 11.32, , , 13, 1, , μ 2, Od. 23.251, 323.