The education of the Guardians must be philosophical; it is for them

to rise to the Idea of the good, to master the science of Good and
Evil; they must be emancipated from the notion that Pleasure is the
good
The education of the Guardians must be philosophical; it is for them
to rise to the Idea of the good, to master the science of Good and
Evil; they must be emancipated from the notion that Pleasure is the
good. To indicate the route to this attainment Plato gives his theory
of cognition generally--the theory of Ideas;--and indicates (darkly)
how these sublime generalities are to be reached.