It is a common remark that men talk most who think least; just as frogs cease their quacking when a light is brought to the water-side.

it is good to have measured myself, to recognize my limitations.

I have a sense of humor; but over the years that sense has developed one blind spot. I can no longer laugh at ignorance or stupidity. Those are our chief enemies, and it is dangerous to make fun of them.

I was lucky because logarithmic plots are a device of the devil.

If one introduces the concept of energy of an earthquake then that is a theoretically derived quantity.

There is nothing more beautiful than cheerfulness in an old face, and among country people it is always a sign of a well-regulated life.

My main point today is that usually one gets what one expects, but very rarely in the way one expected it.