By an exclusive spirit in the case of his faculties, the individual is fatally led to error; but the species is led to truth. It is only by gathering up all the energy of our mind in a single focus, and concentrating a single force in our being, that we give in some sort wings to this isolated force, and that we draw it on artificially far beyond the limits that nature seems to have imposed upon it. If it be certain that all human individuals taken together would never have arrived, with the visual power given them by nature, to see a satellite of Jupiter, discovered by the telescope of the astronomer, it is just as well established that never would the human understanding have produced the analysis of the infinite, or the critique of pure reason, if in particular branches, destined for this mission, reason had not applied itself to special researches, and if, after having, as it were, freed itself from all matter, it had not by the most powerful abstraction given to the spiritual eye of man the force necessary, in order to look into the absolute. But the question is, if a spirit thus absorbed in pure reason and intuition will be able to emancipate itself from the rigorous fetters of logic, to take the free action of poetry, and seize the individuality of things with a faithful and chaste sense? Here nature imposes even on the most universal genius a limit it cannot pass, and truth will make martyrs as long as philosophy will be reduced to make its principal occupation the search for arms against errors. But whatever may be the final profit for the totality of the world, of this distinct and special perfecting of the human faculties, it cannot be denied that this final aim of the universe, which devotes them to this kind of culture, is a cause of suffering, and a kind of malediction for individuals. I admit that the exercises of the gymnasium form athletic bodies; but beauty is only developed by the free and equal play of the limbs. In the same way the tension of the isolated spiritual forces may make extraordinary men; but it is only the well-tempered equilibrium of these forces that can produce happy and accomplished men. And in what relation should we be placed with past and future ages if the perfecting of human nature made sach a sacrifice indispensable? In that case we should have been the slaves of humanity, we should have consumed our forces in servile work for it during some thousands of years, and we should have stamped on our humiliated, mutilated nature the shameful brand of this slavery--all this in order that future generations, in a happy leisure, might consecrate themselves to the cure of their moral health, and develop the whole of human nature by their free culture.