"The cogency of Marxism precisely resides in its ability to reflect accurately the objective laws of historical development; and to represent the most advanced class, the most revolutionary class of modern society, the proletariat, and hence strike roots into the broad masses, to win the hearts and minds of millions and millions of people, and stir them into an implacable and uncompromising fight against the enemy of their class, against world bourgeoisie, and into the building of a classless, communist society."
January 1, 1970
https://en.wikiquote.org/wiki/Tr%C6%B0%E1%BB%9Dng_Chinh