In the Phaedo we are told that the mortal part
belongs to the body, which impedes the immortal
soul in its flight beyond the things of Sense. Eeason
or intelligence, as the faculty of apprehending truth,
is the proper regulator of human actions. Ignorance
is the chief source of evil, and it practically means
a failure to recognise one's proper position and work
in the scheme of the universe. It is clear that this
is an extension, beyond the limits of the State, of
the Idea of Justice described in the Bepuhlic ; not
only the perfect individual, not only the perfect State,
but also the whole Universe is an ordered system in
which each member has its due function.
