"However, with the evolution of modern civilization, the element of physical strength was increasingly eliminated from social activities, industrial production, and even agriculture, so that women of the social classes who earn a living through labor gradually found themselves in a situation more or less the same as that of men. And it is especially in our century that, owing to the laws of political economy-which we will not here take into consideration-and by collaborating directly in the production of social wealth, woman could become aware of her equivalence with man."