SOCRATES: Are you not also skilled in geometry?

HIPPIAS: I am.

SOCRATES: Well, and does not the same hold in that science also? Is not
the same person best able to speak falsely or to speak truly about
diagrams; and he is--the geometrician?

HIPPIAS: Yes.

SOCRATES: He and no one else is good at it?

HIPPIAS: Yes, he and no one else.

SOCRATES: Then the good and wise geometer has this double power in the
highest degree; and if there be a man who is false about diagrams the good
man will be he, for he is able to be false; whereas the bad is unable, and
for this reason is not false, as has been admitted.

HIPPIAS: True.

SOCRATES: Once more--let us examine a third case; that of the astronomer,
in whose art, again, you, Hippias, profess to be a still greater proficient
than in the preceding--do you not?

HIPPIAS: Yes, I am.

SOCRATES: And does not the same hold of astronomy?

HIPPIAS: True, Socrates.