=The material of development is necessary only as a starting point=.--In the organization of the external means of development, there remains a material impress of the internal development, and of that which the soul needs in its progress, during its course, and in its flights. The material part does not contain the impress of the whole soul, any more than the impress of the foot is the impress of the whole body; the aviation-ground is not the sphere of action proper to the aeroplane, but it is the part of _terra-firma_ necessary for flight, and it is also the resting-place, the refuge, the _hangar_ to which the aeroplane must always return. Thus in psychical formation there is a necessary material part from which the spirit rises, and where it should find repose, refuge, and a point of support, Without this it could not grow and rise "freely." In order that it may be a true support it ought "to reproduce its forms" and contain them in the part corresponding to the peculiar functions of the material aid. Thus, for instance, in the first period of the psychical life, the material corresponds to the primitive exercises of the senses--it is in quality and quantity determined by the sensory needs given by nature--and permits an exercise of the activities sufficient to _mature_ a superior psychical state of observation and abstraction. _Vice versa_, nothing corresponds in the material to the subsequent career which the childish spirit accomplishes with such delight and with so much acquisition of knowledge. But we then see the spirit eager for higher kinds of exercise--and now we witness the same primitive phenomenon of attention, which will exercise itself henceforth upon the alphabet and arithmetical material, repeating in a more complex form methodical exercises of the intelligence by linking auditory images with the visible and motor images of the spoken and written word; and in the positive study of quantities, proportions, and number. The same concomitant phenomena of "patience" and "perseverance" then manifest themselves, together with those of vivacity, activity, and joy, characteristic of the spirit when the internal energies have found their _keyboard_, the gymnasium in which they exercise themselves freely and tranquilly. And the spirit, organized in this manner under the guidance of an order which corresponds to its natural order, becomes _fortified_, grows _vigorously_, and manifests itself in the _equilibrium_, the _serenity_, the self-control which produce the wonderful _discipline_ characteristic of the behavior of our children.