Honestly, I cannot understand what people mean when they talk about the freedom of the human will. I have a feeling, for instance, that I will something or other; but what relation this has with freedom I cannot understand at all. I feel that I will to light my pipe and I do it; but how can I connect this up with the idea of freedom? What is behind the act of willing to light the pipe ? Another act of willing?

The magic of compounding interest is truly the eighth wonder of the world!

You never fail until you stop trying.

I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.

The great need to grasp principles had caused me to spend most of my time on fruitless persuits.

One must take what nature gives as one finds it.

We will never be able to solve the problems of tomorrow with the thinking of today