The greatest knowledge a person can possess is the address of the local library.

The comprehensibility of the world seems to me a wonder or eternal secret. Here lies the sense of wonder which increases even more with the development of our knowledge.

It is my fate to be considered an authority, since I spent my youth rebelling against it.

In conclusion I wish to say that in working at the problem here dealt with I have had the loyal assistance of my friend and colleague M. Besso, and that I am indebted to him for several valuable suggestions.

The more a country makes military weapons, the more insecure it becomes: if you have weapons, you become a target for attack.

Generations to come will find it difficult to believe that a man such as Gandhi ever walked the face of this earth.

We still do not know one thousandth of one percent of what nature has revealed to us.