The brute is not affected by the same objects as man; it has neither the same needs, nor the same desires, nor the same whims; it early reaches maturity, while nothing is more rare than to see the human being enjoying all of his faculties, exercising them freely, and making a proper use of them for his own happiness. XCVI.--THERE ARE NO MORE DETESTABLE ANIMALS IN THIS WORLD THAN TYRANTS. We are assured that the human soul is a simple substance; but if the soul is such a simple substance, it ought to be the same in all the individuals of the human race, who all ought to have the same intellectual faculties; however, this is not the case; men differ as much in qualities of mind as in the features of the face. There are in the human race, beings as different from one another as man is from a horse or a dog. What conformity or resemblance do we find between some men? What an infinite distance between the genius of a Locke, of a Newton, and that of a peasant, of a Hottentot, or of a Laplander! Man differs from other animals but by the difference of his organization, which causes him to produce effects of which they are not capable. The variety which we notice in the organs of individuals of the human race, suffices to explain to us the difference which is often found between them in regard to the intellectual faculties. More or less of delicacy in these organs, of heat in the blood, of promptitude in the fluids, more or less of suppleness or of rigidity in the fibers and the nerves, must necessarily produce the infinite diversities which are noticeable in the minds of men. It is by exercise, by habitude, by education, that the human mind is developed and succeeds in rising above the beings which surround it; man, without culture and without experience, is a being as devoid of reason and of industry as the brute. A stupid individual is a man whose organs are acted upon with difficulty, whose brain is hard to move, whose blood circulates slowly; a man of mind is he whose organs are supple, who feels very quickly, whose brain moves promptly; a learned man is one whose organs and whose brain have been exercised a long while upon objects which occupy him. The man without culture, experience, or reason, is he not more despicable and more abominable than the vilest insects, or the most ferocious beasts? Is there a more detestable being in nature than a Tiberius, a Nero, a Caligula? These destroyers of the human race, known by the name of conquerors, have they better souls than those of bears, lions, and panthers? Are there more detestable animals in this world than tyrants? XCVII.--REFUTATION OF MAN'S EXCELLENCE.