There must be a co-education of the different social classes as well as of the two sexes. I might have founded a school giving lessons gratuitously; but a school for poor children only would not be a rational school, since, if they were not taught submission and credulity as in the old type of school, they would have been strongly disposed to rebel, and would instinctively cherish sentiments of hatred.
— FRANCESC FERRER I GUÀRDIA