"Guyau places at the basis of his ethics the conception of life in the broadest sense of the word. Life manifests itself in growth, in multiplication, in spreading. Ethics, according to Guyau, should be a teaching about the means through which Nature's special aim is attained, -the growth and the development of life. The moral element in man needs, therefore, no coercion, no compulsory obligation, no sanction from above; it develops in us by virtue of the very need of man to live a full, intensive, productive life. Man is not content with ordinary, commonplace existence; he seeks the opportunity to extend its limits, to accelerate its tempo, to fill it with varied impressions and emotional experiences. And as long as he feels in himself the ability to attain this end he will not wait for any coercion or command from without. "Duty," says Guyau, is "the consciousness of a certain inward power, by nature superior to all other powers. To feel inwardly the greatest that one is capable of doing is really the first consciousness of what it is one's duty to do.""