An English criminal, you know is always better concealed in London than anywhere else.
I wanted to see what no one had yet observed, even if I had to pay for this curiosity with my life.
He must have travelled everywhere, at least in the spirit.
Powder is but a thing of yesterday, and war is as old as the human race--unhappily.
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.
[we see that] science is eminently perfectible, and that each theory has constantly to give way to a fresh one.