The Republic by Plato Part 2 Page 68

Yes, he said, that sort of thing is certainly very blameable; but what are the stories which you mean?

First of all, I said, there was that greatest of all lies in high places, which the poet told about Uranus, and which was a bad lie too, — I mean what Hesiod says that Uranus did, and how Cronus retaliated on him. The doings of Cronus, and the sufferings which in turn his son inflicted upon him, even if they were true, ought certainly not to be lightly told to young and thoughtless persons; if possible, they had better be buried in silence.

But if there is an absolute necessity for their mention, a chosen few might hear them in a mystery, and they should sacrifice not a common (Eleusinian) pig, but some huge and unprocurable victim; and then the number of the hearers will be very few indeed.