It is surmounting difficulties that makes heroes.

Virulence appears in a new light which cannot but be alarming to humanity; unless nature, in her evolution down the ages (an evolution which, as we now know, has been going on for millions, nay, hundreds of millions of years), has finally exhausted all the possibilities of producing virulent or contagious diseases - which does not seem very likely.

Chance favors those who are prepared.

One does not ask of one who suffers: What is your country and what is your religion? One merely says: You suffer, that is enough for me.

If science has no country, the scientist should have one, and ascribe to it the influence which his works may have in this world.

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world. Science is the highest personification of the nation because that nation will remain the first which carries the furthest the works of thought and intelligence.

Will opens the door to success, both brilliant and happy.