One can state, without exaggeration, that the observation of and the search for similarities and differences are the basis of all human knowledge.

The truthful man is usually a liar.

Contentment is the only real wealth.

I am not aware that I have deserved any notoriey, and I have no taste for its buzz.

If I have a thousand ideas and only one turns out to be good, I am satisfied.

It is my express wish that in awarding the [Nobel Prizes] no consideration be given to the nationality of the candidates, but that the most worthy shall receive the prize, whether he be Scandinavian or not.

Good wishes alone will not ensure peace.