For us, Marxism is always open because there are always new xperiences, there are always new facts, including facts about the past, which have to be incorporated in the corpus of scientific socialism.
And Marx spoke of the fact that socialism will be the kingdom of freedom, where man realizes himself in a way that humankind has never seen before. This was an inspiring body of literature to read.
When one makes a Revolution, one cannot mark time; one must always go forward - or go back. He who now talks about the "freedom of the press" goes backward, and halts our headlong course towards Socialism.
If Socialism can only be realized when the intellectual development of all the people permits it, then we shall not see Socialism for at least five hundred years.
