And in this renewal lies the great magic of sex. The life of an individual goes on apparently the same from day to day. But as a matter of fact there is an inevitable electric accumulation in the nerves and the blood, an accumulation which weighs there and broods there with intolerable pressure. And the only possible means of relief and renewal is in pure passional interchange. There is and must be a pure passional interchange from the upper self, as when men unite in some great creative or religious or constructive activity, or as when they fight each other to the death. The great goal of creative or constructive activity, or of heroic victory in fight, must always be the goal of the daytime self. But the very possibility of such a goal arises out of the vivid dynamism of the conscious blood. And the blood in an individual finds its great renewal in a perfected sex circuit.