Ten Years Later: The Man in The Iron Mask by Alexandre Dumas Chapter 9 Page 15

“They would be immense, infinite, terrific, insurmountable, if, as I have said, all things did not concur to render them of absolutely no account. There is no danger either for you or for me, if the constancy and intrepidity of your royal highness are equal to that perfection of resemblance to your brother which nature has bestowed upon you.

I repeat it, there are no dangers, only obstacles; a word, indeed, which I find in all languages, but have always ill-understood, and, were I king, would have obliterated as useless and absurd.”

“Yes, indeed, monsieur; there is a very serious obstacle, an insurmountable danger, which you are forgetting.”

“Ah!” said Aramis.

“There is conscience, which cries aloud; remorse, that never dies.”