Inspiration is the impact of a fact on a well-prepared mind

If it is a terrifying thought that life is at the mercy of the multiplication of these minute bodies [microbes], it is a consoling hope that Science will not always remain powerless before such enemies.

Blessed is he who carries within himself a God, an ideal, and obeys it.

To bring one's self to believe in a truth that has just dawned upon one is the first step towards progress; to persuade others is the second.

There does not exist a category of science to which one can give the name applied science. There are sciences and the applications of science, bound together as the fruit of the tree which bears it.

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.

Change only favours minds that are diligently looking and preparing for discovery.