The world is not threatened by evil people, but by those who allow evil to take place.

Nationalism, on my opinion, is nothing more than an idealistic rationalization for militarism and aggression.

What I'm really interested in is whether God could have made the world in a different way; that is, whether the necessity of logical simplicity leaves any freedom at all.

You cannot simultaneously prevent and prepare for war.

It is the same with people as it is with riding a bike. Only when moving can one comfortably maintain one's balance.

If I give you a pfennig, you will be one pfennig richer and I'll be one pfennig poorer. But if I give you an idea, you will have a new idea, but I shall still have it too.

We all try to escape pain and death, while we seek what is pleasant.