Mind … reveals its independence of its corporeity in the fact that
it can develop itself [prematurely]. Children often have a mental
development far in advance of their years.… In general, however,
it must be admitted that intellect does not come before its time.
It is almost solely in the case of artistic talents that their premature
appearance is an indication of excellence. On the other hand, the
premature development of intelligence generally which has been
observed in some children has not, as a rule, been followed by
great intellectual distinction in manhood.
—HEGEL, The Philosophy of Spirit
If only we could know what was going on in a baby's mind while
observing him in action we could certainly understand everything
there is to psychology.
—JEAN PIAGET, [The First Year of Life of the Child.]