SOCRATES: I fancy to myself Heracleitus repeating wise traditions of
antiquity as old as the days of Cronos and Rhea, and of which Homer also
spoke.

HERMOGENES: How do you mean?

SOCRATES: Heracleitus is supposed to say that all things are in motion and
nothing at rest; he compares them to the stream of a river, and says that
you cannot go into the same water twice.

HERMOGENES: That is true.

SOCRATES: Well, then, how can we avoid inferring that he who gave the
names of Cronos and Rhea to the ancestors of the Gods, agreed pretty much
in the doctrine of Heracleitus? Is the giving of the names of streams to
both of them purely accidental? Compare the line in which Homer, and, as I
believe, Hesiod also, tells of

'Ocean, the origin of Gods, and mother Tethys (Il.--the line is not found
in the extant works of Hesiod.).'

And again, Orpheus says, that

'The fair river of Ocean was the first to marry, and he espoused his sister
Tethys, who was his mother's daughter.'

You see that this is a remarkable coincidence, and all in the direction of
Heracleitus.