“Will power, the kind that, if need be, makes us set our teeth and endure suffering, is the principal weapon of the apprentice engaged in manual work. But, contrary to the usual belief, it has practically no place in study. The intelligence can only be led by desire. For there to be desire, there must be pleasure and joy in the work. The intelligence only grows and bears fruit in joy. The joy of learning is as indispensable in study as breathing is in running.”