Silence fell. The brothers looked at one another in the darkness. And Pierre now understood things. He saw that Guillaume was changed, that the terrible gust of revolutionary contagion sweeping over Paris had transformed him. It had all come from the duality of his nature, the presence of contradictory elements within him. On one side one found a scientist whose whole creed lay in observation and experiment, who, in dealing with nature, evinced the most cautious logic; while on the other side was a social dreamer, haunted by ideas of fraternity, equality and justice, and eager for universal happiness. Thence had first come the theoretical anarchist that he had been, one in whom science and chimeras were mingled, who dreamt of human society returning to the harmonious law of the spheres, each man free, in a free association, regulated by love alone. Neither Theophile Morin with the doctrines of Proudhon and Comte, nor Bache with those of St. Simon and Fourier, had been able to satisfy his desire for the absolute. All those systems had seemed to him imperfect and chaotic, destructive of one another, and tending to the same wretchedness of life. Janzen alone had occasionally satisfied him with some of his curt phrases which shot over the horizon, like arrows conquering the whole earth for the human family. And then in Guillaume's big heart, which the idea of want, the unjust sufferings of the lowly and the poor exasperated, Salvat's tragic adventure had suddenly found place, fomenting supreme rebellion. For long weeks he had lived on with trembling hands, with growing anguish clutching at his throat. First had come that bomb and the explosion which still made him quiver, then the vile cupidity of the newspapers howling for the poor wretch's head, then the search for him and the hunt through the Bois de Boulogne, till he fell into the hands of the police, covered with mud and dying of starvation. And afterwards there had been the assize court, the judges, the gendarmes, the witnesses, the whole of France arrayed against one man and bent on making him pay for the universal crime. And finally, there had come the guillotine, the monstrous, the filthy beast consummating irreparable injustice in human justice's name. One sole idea now remained to Guillaume, that idea of justice which maddened him, leaving naught in his mind save the thought of the just, avenging flare by which he would repair the evil and ensure that which was right for all time forward. Salvat had looked at him, and contagion had done its work; he glowed with a desire for death, a desire to give his own blood and set the blood of others flowing, in order that mankind, amidst its fright and horror, should decree the return of the golden age.