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.

Science belongs to no one country.

Nothing is lost and nothing is created in the operations of art as those of nature.

When one works and imagines and dreams of nothing else than the search for answers that God has posed, it is difficult to be so still.

Did you ever observe to whom the accidents happen? Chance favors only the prepared 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.

Worship the spirit of criticism. If reduced to itself it is not an awakener of ideas or a stimulant to great things, but, without it, everything is fallible; it always has the last word.