[Not enough is known about solid geometry] and for two reasons: in the first place, no government places value on it; this leads to a lack of energy in the pursuit of it, and it is difficult. In the second place, students cannot learn it unless they have a teacher. But then a teacher can hardly be found.
PlatoThose who intend on becoming great should love neither themselves or their own things, but only what is just, whether it happens to be done by themselves or others.
Plato