Mary Balogh said this quote

If you are never frightened, sir, you would never find out what you was made of and what you was capable of doing. You would never become a better man than what you started out being. P'raps this is what you will discover - what you are made of and what you are capable of. And when you finally do remember who you are, p'raps you will find that you have become a better man than he ever was. P'raps he was a man why never ever grew any more once he reached manhood. P'raps he needed to do something drastic like losing his memory so that he could get his life unstuck.