Don't forget any affront done to you and to all our people, the time of revenge will come and must be put to good use.

In a political struggle of class against class, organization of trade unions is the most important weapon.

All that is real in human history becomes irrational in the process of time.

One day we shall certainly 'reduce' thought experimentally to molecular and chemical motions in the brain; but does that exhaust the essence of thought?

Competition permits the capitalist to deduct from the price of labour power that which the family earns from its own little garden or field; the workers are compelled to accept any piece wages offered to them, because otherwise they would get nothing at all, and they could not live from the products of their small-scale agriculture alone, and because, on the other hand, it is just this agriculture and landownership which chains them to the spot and prevents them from looking around for other employment.

Just as Marx used to say about the French Marxists of the late 'seventies: All I know is that I am not a Marxist.

The free development of each is the condition for the free development of all.