"The only way to abolish the existing wretched state of affairs is by a violent overthrow of the whole traditional social order."

"Social progress can be measured by the social position of the female sex."

"As a teacher of German philosophy he also had the advantage over me that he himself understood nothing about it."

"A commodity appears at first sight an extremely obvious, trivial thing. But its analysis brings out that it is a very strange thing, abounding in metaphysical subtleties and theological niceties."

"The meaning of history is the progress of humanity toward freedom and self-consciousness."