Capital is dead labor, which, vampire-like, lives only by sucking living labor, and lives the more, the more labor it sucks.
Reason has always existed, but not always in a reasonable form.
Sell a man a fish, he eats for a day, teach a man how to fish, you ruin a wonderful business opportunity.
Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science.
The history of all previous societies has been the history of class struggles.
The meaning of peace is the absence of opposition to socialism.