"The country that is more developed industrially only shows, to the less developed, the image of its own future."

"The Jewish Nigger Lassalle is fortunately leaving at the end of this week... It is now completely clear to me that, as his cranial structure and hair texture prove, he descends from the Negroes who jo…"

"The ruling ideas of each age have ever been the ideas of its ruling class."

"The meaning of peace is the absence of opposition to socialism."

"I infected him very much to his detriment with Hegelianism, which, owing to his lack of German, he could not study properly."