STRANGER: Then any taking away of evil from the soul may be properly called purification?
THEAETETUS: Yes.
STRANGER: And in the soul there are two kinds of evil.
THEAETETUS: What are they?
STRANGER: The one may be compared to disease in the body, the other to deformity.
THEAETETUS: I do not understand.
STRANGER: Perhaps you have never reflected that disease and discord are the same.
THEAETETUS: To this, again, I know not what I should reply.
STRANGER: Do you not conceive discord to be a dissolution of kindred elements, originating in some disagreement?
THEAETETUS: Just that.