STRANGER: Then we shall be right in calling vice a discord and disease of
the soul?

THEAETETUS: Most true.

STRANGER: And when things having motion, and aiming at an appointed mark,
continually miss their aim and glance aside, shall we say that this is the
effect of symmetry among them, or of the want of symmetry?

THEAETETUS: Clearly of the want of symmetry.

STRANGER: But surely we know that no soul is voluntarily ignorant of
anything?

THEAETETUS: Certainly not.

STRANGER: And what is ignorance but the aberration of a mind which is bent
on truth, and in which the process of understanding is perverted?

THEAETETUS: True.

STRANGER: Then we are to regard an unintelligent soul as deformed and
devoid of symmetry?

THEAETETUS: Very true.

STRANGER: Then there are these two kinds of evil in the soul--the one
which is generally called vice, and is obviously a disease of the soul...

THEAETETUS: Yes.