We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know.

It is certainly true that principles cannot be more securely founded than on experience and consciously clear thinking.

[Ernest Rutherford is]...a second Newton.

He who finds a thought that lets us a little deeper into the eternal mystery of nature has been granted great peace.

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

The intuitive mind is a sacred gift.

How many people are trapped in their everyday habits: part numb, part frightened, part indifferent? To have a better life we must keep choosing how we are living.