The monotony and solitude of a quiet life stimulates the creative mind.

A photograph never grows old. You and I change, people change all through the months and years but a photograph always remains the same. How nice to look at a photograph of mother or father taken many years ago. You see them as you remember them. But as people live on, they change completely. That is why I think a photograph can be kind.

It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.

Music has no effect on research work, but both are born of the same source and complement each other through the satisfaction they bestow

Men should continue to fight, but they should fight for things worth while, not for imaginary geographical lines, racial prejudices and private greed draped in the color's of patriotism.

Why do people speak of great men in terms of nationality? Great Germans, great Englishmen? Goethe always protested against being called a German poet. Great men are simply men and are not to be considered from the point of view of nationality, nor should the environment in which they were brought up be taken into account.

As to science, we may well define it for our purpose as "methodical thinking directed toward finding regulative connections between our sensual experiences".