STRANGER: And there is the other, which they call ignorance, and which,
because existing only in the soul, they will not allow to be vice.

THEAETETUS: I certainly admit what I at first disputed--that there are two
kinds of vice in the soul, and that we ought to consider cowardice,
intemperance, and injustice to be alike forms of disease in the soul, and
ignorance, of which there are all sorts of varieties, to be deformity.

STRANGER: And in the case of the body are there not two arts which have to
do with the two bodily states?

THEAETETUS: What are they?

STRANGER: There is gymnastic, which has to do with deformity, and
medicine, which has to do with disease.

THEAETETUS: True.

STRANGER: And where there is insolence and injustice and cowardice, is not
chastisement the art which is most required?

THEAETETUS: That certainly appears to be the opinion of mankind.

STRANGER: Again, of the various kinds of ignorance, may not instruction be
rightly said to be the remedy?

THEAETETUS: True.

STRANGER: And of the art of instruction, shall we say that there is one or