In the middle of difficulties lie opportunities.

Science without religion is lame, religion without science is blind.

If there is no price to be paid, it is also not of value.

The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.

How can it be that mathematics, being after all a product of human thought which is independent of experience, is so admirably appropriate to the objects of reality?

I know very well that many scientists consider dowsing as they do astrology, as a type of ancient superstition. According to my conviction this is, unjustified. The dowsing rod is a simple instrument which shows the uncanny reaction of the human nervous system to certain factors which are unknown to us at this time.

Understanding physics is child's play when compared to understanding child's play.