The world is so great and rich, and life so full of variety, that you can never lack occasions for poems.

If you modestly enjoy your fame you are not unworthy to rank with the holy.

The history of science is science itself; the history of the individual, the individual.

Chess is the touchstone of intellect.

To quit smoking, you must first want to quit, but then you must also do the quitting

The credit of advancing science has always been due to individuals and never to the age.

Science and art belong to the whole world, and before them vanish the barriers of nationality.