Homer, Odyssey 17.218

 

 

“God always bring like men together.”

 

αἰεί τοι τὸν ὁμοῖον ἄγει θεὸς ὡς τὸν ὁμοῖον

 

This, of course, is not necessarily a positive thing (in the Odyssey the wicked cowherd Melantheus says this to insult Odysseus and Eumaeus) or true: as Socrates points out (drawing on Hesiod), like often competes with like