Spring makes everything young again except man.

No joy in nature is so sublimely affecting as the joy of a mother at the good fortune of a child.

According to Democritus, truth lies at the bottom of a well, the water of which serves as a mirror in which objects may be reflected. I have heard, however, that some philosophers, in seeking for truth, to pay homage to her, have seen their own image and adored it instead.

Refining is inevitable in science when you have made measurements of a phenomenon for a long period of time.

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.

In every area of the world where there is earthquake risk, there are still many buildings of this type; it is very frustrating to try to get rid of them.

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