Ideas are more powerful than guns. We would not let our enemies have guns, why should we let them have ideas.
If any foreign minister begins to defend to the death a 'peace conference', you can be sure his government has already placed its orders for new battleships and airplanes.
Mankind is divided into rich and poor, into property owners and exploited; and to abstract oneself from this fundamental division; and from the antagonism between poor and rich means abstracting oneself from fundamental facts.