[Geology] opens up such wide intellectual vistas and supplies a more perfectly unified and more comprehensive conception of nature than any other science.

The most revolutionary act is a clear view of the world as it really is.

What do you want with these special Jewish pains? I feel as close to the wretched victims of the rubber plantations in Putamayo and the blacks of Africa with whose bodies the Europeans play ball… I have no special corner in my heart for the ghetto: I am at home in the entire world, where there are clouds and birds and human tears.

Before a revolution happens, it is perceived as impossible; after it happens, it is seen as having been inevitable.

Those who do not move, do not notice their chains.

There is no democracy without socialism, and no socialism without democracy.

We will be victorious if we have not forgotten how to learn.