“Si l'habitude ne nous simplifiait pas les choses, s'habiller ou se déshabiller suffirait pour nous à l'emploi d'une journée.”Physiology of Mind
En français, cette phrase est un condensé du texte original suivant : "If an act became no easier after being done several times, if the careful direction of consciousness were necessary to its accomplishment on each occasion, it is evident that the whole activity of a lifetime might be
confined to one or two deeds -- that no progress could take place in development. A man might be occupied all day in dressing and undressing himself."