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On the Universe, XLIII. And Heracleitus rebukes the poet who says, “would that strife might perish from among gods and men.” For there could be (he said) no attunement without the opposites high and low, and no animals without the opposites male and female.

XLIV. War is the father of all and the king of all; some he has marked out to be gods and some to be men, some he has made slaves and some free.

XLV. They understand not how that which is at variance with itself agrees with itself. There is attunement of opposite tensions, like that of the bow and of the harp.

(Attunement: παλίντροπος, “a harmony from opposite shapes.”)