SOCRATES: And is the art of the pilot evil counsel?

ALCIBIADES: No.

SOCRATES: But good counsel?

ALCIBIADES: Yes, that is what I should say,--good counsel, of which the
aim is the preservation of the voyagers.

SOCRATES: True. And what is the aim of that other good counsel of which
you speak?

ALCIBIADES: The aim is the better order and preservation of the city.

SOCRATES: And what is that of which the absence or presence improves and
preserves the order of the city? Suppose you were to ask me, what is that
of which the presence or absence improves or preserves the order of the
body? I should reply, the presence of health and the absence of disease.
You would say the same?

ALCIBIADES: Yes.

SOCRATES: And if you were to ask me the same question about the eyes, I
should reply in the same way, 'the presence of sight and the absence of
blindness;' or about the ears, I should reply, that they were improved and
were in better case, when deafness was absent, and hearing was present in
them.

ALCIBIADES: True.