Most people go on living their everyday life: half-frightened, half indifferent, they behold the ghostly tragic-comedy that is being performed on the international stage before the eyes and ears of the world.

The true value of a human being can be found in the degree to which he has attained liberation from the self.

We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there need be no things that correspond to it, even approximately.

The greatest knowledge a person can possess is the address of the local library.

Humankind's desire for peace can be realized only by the creation of a world government.

You can't use an old map to explore a new world.

Imagination encircles the world.