Everything is possible for an eccentric, especially when he is English.

I wanted to see what no one had yet observed, even if I had to pay for this curiosity with my life.

How many things have been denied one day, only to become realities the next!

[we see that] science is eminently perfectible, and that each theory has constantly to give way to a fresh one.

Travel enables us to enrich our lives with new experiences, to enjoy and to be educated, to learn respect for foreign cultures, to establish friendships, and above all to contribute to international cooperation and peace throughout the world.

At Kiel, as elsewhere, a day goes by somehow or other.

Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.