Herein is a capital truth. It is not the natural capacity, the congenital gift, nor is it the effort, the will, the work, which in the intelligence as sway over the energy capable of making it fully efficacious. It is uniquely the desire, that is, the desire for beauty. This desire, given a certain degree of intensity and purity, is the same thing as genius. At all levels it is the same thing as attention. If this were understood, the whole conception of teaching would be quite other than it is. First, one would realize that the intelligence functions only in joy. Intelligence is perhaps even the only one of our faculties to which joy is indispensable. The absence of joy asphyxiates it.