Science knows no country because it is the light that iluminates the world

Without theory, practice is but routine born of habit. Theory alone can bring forth and develop the spirit of invention. ... [Do not] share the opinion of those narrow minds who disdain everything in science which has not an immediate application. ... A theoretical discovery has but the merit of its existence: it awakens hope, and that is all. But let it be cultivated, let it grow, and you will see what it will become.

Chance favours the trained mind.

Science advances through tentative answers to a series of more and more subtle questions which reach deeper and deeper into the essence of natural phenomena.

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

The more I study nature, the more I stand amazed at the work of the Creator. Science brings men nearer to God.

Where observation is concerned, chance favors only the prepared mind.