The mortal nature is seeking as far as is possible to be everlasting and immortal: and this is only to be attained by generation, because the new is always left in the place of the old.
Plato[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.
Plato