"The old society does not perish until it has exhausted all its creative possibilities."

"The working class is the only class that can save humanity from barbarism."

"The bureaucracy, which by its very nature is conservative, is the principal obstacle to social progress."

"The dialectic is not a magical master key for all questions. It is not an algebra. It is a method of analysis, a method of investigation."

"Life is not an easy matter... You cannot live through it without falling into a state of despair and cynicism unless you have an ideal to cling to."