I didn't find movie lines in Lenin's works. "Thinking about the past in the name of revolution, forgetting the past means betrayal." This sentence is almost a household name, and many people think it is a famous saying of Lenin. However, it is actually a line of Lenin in China's children's play The Name of Revolution. In the Name of Revolution was widely spread in 1950s and made into a film in 1960s. With the popularity of children's dramas and movies, this sentence has been recited by more and more people and mistaken for Lenin's words.

As for "Lenin's sentence, in addition to the lack of scientific basis, there is a strong class nature, which violates the basic theory of human existence." I think the person who said this is definitely a bourgeois scholar, and his words are very procrastinating. Forgetting the past and discarding the past are two different concepts.