What does the Joker’s famous quote at the beginning of Batman Begins 2 The Dark Knight mean?

The clown was ostensibly answering the bank clerk’s question: Criminals in this city all believe in “respect and honor.” Look at you, what do you believe in? The clown's answer is: I believe that what doesn't kill you makes you weird. On the surface, it is saying that a bomb placed in your mouth will not kill you and will make you weird. In essence, it is saying that in the face of extreme fear, all your beliefs and rules will be lost. In the eyes of people who have faith now , you become weird.