Those who don't move don't notice their chains.

The more that social democracy develops, grows, and becomes stronger, the more the enlightened masses of workers will take their own destinies, the leadership of their movement, and the determination of its direction into their own hands.

With the true artist, the social formula that he recommends is a matter of secondary importance; the source of his art, its animating spirit, is decisive.

History is the only true teacher, the revolution the best school for the proletariat.

Only to the rude ear of one who is quite indifferent does the song of a bird seem always the same.

Those who don't move don't notice their chains.

The most revolutionary thing one can do is always to proclaim loudly what is happening.