Knowledge helps only when it descends into habits.
Understanding something in one way does not preclude understanding it in other ways.
The foundations of any subject may be taught to anybody at any age in some form.
Knowledge is justified belief.
It is sentimentalism to assume that the teaching of life can always be fitted to the child's interests, just as it is empty formalism to force the child to parrot the formulas of adult society. Interests can be created and stimulated.
We are only now on the threshold of knowing the range of the educability of man-the perfectibility of man. We have never addressed ourselves to this problem before.