There are two ways of resisting war: the legal way and the revolutionary way. The legal way involves the offer of alternatinve service not as a privilege for a few but as a right for all. The revolutionary view involves an uncompromising resistance, with a view to breaking the power of militarism in time of peace or the resources of the state in time of war.

What we don't know is much more than what we know.

At present every coachman and every waiter argues about whether or not the relativity theory is correct.

Man has an intense desire for assured knowledge.

The whole of science is nothing more than a refinement of everyday thinking.

When the number of factors coming into play in a phenomenological complex is too large scientific method in most cases fails. One need only think of the weather, in which case the prediction even for a few days ahead is impossible.

I never teach my pupils, I only attempt to provide the conditions in which they can learn.