Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

Make everything as simple as possible, but not simpler.

There's something to be said for relatives...it has to be said because it's unprintable!

In my opinion there is no other salvation for civilization and even for the human race than the creation of a world government with security on the basis of law. As long as there are sovereign states with their separate armaments and armament secrets, new world wars cannot be avoided.

Nothing truly valuable arises from ambition or from a mere sense of duty; it stems rather from love and devotion towards men and towards objective things.

When a man is sufficiently motivated, discipline will take care of itself.

The dog is very smart. He feels sorry for me because I receive so much mail; that's why he tries to bite the mailman.