euthydemus   

shoot up many new heads when one of them was cut off; especially when
he saw a second monster of a sea-crab, who was also a Sophist, and
appeared to have newly arrived from a sea-voyage, bearing down upon
him from the left, opening his mouth and biting. When the monster was
growing troublesome he called Iolaus, his nephew, to his help, who
ably succoured him; but if my Iolaus, who is my brother Patrocles [the
statuary], were to come, he would only make a bad business worse.
And now that you have delivered yourself of this strain, said
Dionysodorus, will you inform me whether Iolaus was the nephew of
Heracles any more than he is yours?
I suppose that I had best answer you, Dionysodorus, I said, for you
will insist on asking that I pretty well know-out of envy, in order to
prevent me from learning the wisdom of Euthydemus.
Then answer me, he said.
Well then, I said, I can only reply that Iolaus was not my nephew at
all, but the nephew of Heracles; and his father was not my brother
Patrocles, but Iphicles, who has a name rather like his, and was the
brother of Heracles.
And is Patrocles, he said, your brother?
Yes, I said, he is my half-brother, the son of my mother, but not of
my father.
Then he is and is not your brother.
Not by the same father, my good man, I said, for Chaeredemus was his
father, and mine was Sophroniscus.
And was Sophroniscus a father, and Chaeredemus also?
Yes, I said; the former was my father, and the latter his.
Then, he said, Chaeredemus is not a father.
He is not my father, I said.
But can a father be other than a father? or are you the same as a
stone?
I certainly do not think that I am a stone, I said, though I am afraid
that you may prove me to be one.
Are you not other than a stone?
I am.
And being other than a stone, you are not a stone; and being other
than gold, you are not gold?
Very true.
And so Chaeredemus, he said, being other than a father, is not a
father?
I suppose that he is not a father, I replied.
For if, said Euthydemus, taking up the argument, Chaeredemus is a
father, then Sophroniscus, being other than a father, is not a father;
and you, Socrates, are without a father.
Ctesippus, here taking up the argument, said: And is not your father
in the same case, for he is other than my father?
Assuredly not, said Euthydemus.
Then he is the same?
He is the same.
I cannot say that I like the connection; but is he only my father,
Euthydemus, or is he the father of all other men?
Of all other men, he replied. Do you suppose the same person to be a
father and not a father?
Certainly, I did so imagine, said Ctesippus.
And do you suppose that gold is not gold, or that a man is not a man?
They are not "in pari materia," Euthydemus, said Ctesippus, and you
had better take care, for it is monstrous to suppose that your father
is the father of all.
But he is, he replied.
What, of men only, said Ctesippus, or of horses and of all other
animals?
Of all, he said.
And your mother, too, is the mother of all?
Yes, our mother too.
Yes; and your mother has a progeny of sea-urchins then?