Marxism is always open, always critical, always self-critical.
Revolution is not a goal in itself.
Factions are a sign of illness in a party.
And you cannot have a socialist revolution commandeered from the top, ordered around by some omniscient leader or group of leaders
Mistakes in themselves are unavoidable.
You need a vanguard organization in order to overcome the dangerous potential brought about by the uneven development of class militancy and class consciousness.