"In the struggle against that state of affairs, criticism is no passion of the head, it is the head of passion. It is not a lancet, it is a weapon. Its object is its enemy, which it wants not to refute but to exterminate. ... It no longer assumes the quality of an end-in-itself, but only of a means. Its essential pathos is indignation, its essential work is denunciation."
"Criticism dealing with this content is criticism in a hand-to-hand fight, and in such a fight the point is not whether the opponent is a noble, equal, interesting opponent, the point is to strike him."
"The weapon of criticism cannot, of course, replace criticism of the weapon, material force must be overthrown by material force; but theory also becomes a material force as soon as it has gripped the masses. Theory is capable of gripping the masses as soon as it demonstrates ad hominem, and it demonstrates ad hominem as soon as it becomes radical. To be radical is to grasp the root of the matter. But, for man, the root is man himself."
"Theory is fulfilled in a people only insofar as it is the fulfilment of the needs of that people."