Theres only one requirement of any of us, and that is to be courageous. Because courage, as you might know, defines all other human behavior. And, I believe – because Ive done a little of this myself – pretending to be courageous is just as good as the real thing. – David Letterman
The violent reaction on the recent development of modern physics can only be understood when one realises that here the foundations of physics have started moving and that this motion has caused the feeling that the ground would be cut from science. – Werner Heisenberg
