On résiste à l'invasion des armées; on ne résiste pas à l'invasion des idées. - Victor Hugo

Nothing discernible to the eye of the spirit is more brilliant or obscure than man; nothing is more formidable, complex, mysterious, and infinite. There is a prospect greater than the sea, and it is the sky; there is a prospect greater than the sky, and it is the human soul.

Adversity makes men, and prosperity makes monsters.

So long as there shall exist, by reason of law and custom, a social condemnation which, in the midst of civilization, artificially creates a hell on earth, and complicates with human fatality a destiny that is divine; so long as the three problems of the century - the degradation of man by the exploitation of his labour, the ruin of women by starvation and the atrophy of childhood by physical and spiritual night are not solved; so long as, in certain regions, social asphyxia shall be possible; in other words and from a still broader point of view, so long as ignorance and misery remain on earth, there should be a need for books such as this.