Religion Is The Opium Of The Masses.

The Rule Of The Bourgeois Democrats [in Pre-federal Germany], From The Very First, Will Carry Within It The Seeds Of Its Own Destruction

Once The Inner Connection Is Grasped, All Theoretical Belief In The Permanent Necessity Of Existing Conditions Collapses Before Their Collapse In Practice -- Letter To Ludwig Kugelmann (july 11, 1868)

History Does Nothing, Possesses No Enormous Wealth, Fights No Battles. It Is Rather Man, The Real, Living Man, Who Does Everything, Possesses, Fights. It Is Not History, As If She Were A Person Apart, Who Uses Men As A Means To Work Out Her Purposes, But History Itself Is Nothing But The Activity Of Men Pursuing Their Purposes.

Social Progress Can Be Measured Exactly By The Social Position Of The Fair Sex.

...the Realm Of Freedom Does Not Commence Until The Point Is Passed Where Labor Under The Compulsion Of Necessity And Of External Utility Is Required.