The most important thing is to not stop questioning.

An empty stomach is not a good political adviser.

The horizon of many people is a circle with a radius of zero. They call this their point of view.

There is no salvation for civilization, or even the human race, other than the creation of a world government.

Without deep reflection one knows from daily life that one exists for other people.

Galileo had already made a significant beginning toward a knowledge of the law of motion. He discovered the law of inertia and the law of bodies falling freely in the gravitational field of the earth.

What can the schools do to defend democracy? Should they preach a specific political doctrine? I believe they should not. If they are able to teach young people to have a critical mind and a socially oriented attitude, they will have done all that is necessary.