“It is worth while to point out the differing characters of a system and a method, because parents let themselves be run away with often enough by some plausible ‘system,’ the object of which is to produce development in one direction—of the muscles, of the memory, of the reasoning faculty—were a complete all-round education. This easy satisfaction arises from the sluggishness of human nature, to which any definite scheme is more agreeable than the constant watchfulness, the unforeseen action, called for when the whole of a child’s existence is to be used as the means of his education.”