What the world needs is not redemption from sin but redemption from hunger and oppression; it has no need to pin its hopes upon Heaven, it has everything to hope for from this earth.

One does not set fire to a world which is already lost

In a society which is structured the wrong way, piety has no effect.

Communism is a proposition to structure the world more reasonably, a proposition for changing the world. As such, we have to analyze it and, if we deem it reasonable, act upon it.

Humor is the mask of wisdom.

There are risks which are not acceptable: the destruction of humanity is one of them

Whoever is content with the world, and who profits from its lack of justice, does not want to change it.