IX
Nothing, therefore, can agree better with the nature of any object than other individuals of the same kind, and so (see § VII) there is nothing more profitable to man for the preservation of his being and the enjoyment of a rational life than a man who is guided by reason. Again, since there is no single thing we know which is more excellent than a man who is guided by reason, it follows that there is nothing by which a person can better show how much skill and talent he possesses than by so educating men that at last they will live under the direct authority of reason.