• "If it is true that the law of Nature is Harmony, I suggest one would be entitled to ask why Nature has waited for anarchists to be born, and goes on waiting for them to triumph, in order to destroy the terrible and destructive conflicts from which mankind has already suffered. Would one not be closer to the truth in saying that anarchy is the struggle, in human society, against the disharmonies of Nature?"
• "...two passions: the desire for knowledge and the desire to act for the good of humanity, two noble passions which can be mutually useful and which one would like to see in all men, without being, for all this, one and the same thing."
• "PETER KROPOTKIN IS WITHOUT DOUBT ONE OF THOSE WHO have contributed perhaps more—perhaps more even than Bakunin and Elisee Reclus—to the elaboration and propagandation of anarchist ideas. And he has therefore well deserved the recognition and the admiration that all anarchists feel for him."