The same practice may be followed, I said, in all these things —labours,
lessons, dangers —and he who is most at home in all of them ought to be
enrolled in a select number.
At what age?
At the age when the necessary gymnastics are over: the period whether of two
or three years which passes in this sort of training is useless for any other
purpose; for sleep and exercise are unpropitious to learning; and the trial of
who is first in gymnastic exercises is one of the most important tests to
which our youth are subjected.
Certainly, he replied.
After that time those who are selected from the class of twenty years old will
be promoted to higher honour, and the sciences which they learned without any
order in their early education will now be brought together, and they will be
able to see the natural relationship of them to one another and to true being.
Yes, he said, that is the only kind of knowledge which takes lasting root.
Yes, I said; and the capacity for such knowledge is the great criterion of
dialectical talent: the comprehensive mind is always the dialectical.