"The achievement and maintenance of the dictatorship of the proletariat is impossible without a party which is strong by reason of its solidarity and iron discipline. But iron discipline in the Party is inconceivable without unity of will, without complete and absolute unity of action on the part of all members of the Party. This does not mean, of course, that the possibility of conflicts of opinion within the Party is thereby precluded. On the contrary, iron discipline does not preclude but presupposes criticism and conflict of opinion within the Party. Least of all does it mean that discipline must be "blind." On the contrary, iron discipline does not preclude but presupposes conscious and voluntary submission, for only conscious discipline can be truly iron discipline. But after a conflict of opinion has been closed, after criticism has been exhausted and a decision has been arrived at, unity of will and unity of action of all Party members are the necessary conditions without which neither Party unity nor iron discipline in the Party is conceivable."