Who said "I can't let you down, man."?

This quote is attributed to Jesse Pinkman.

I can't let you down, man. - Jesse Pinkman

"I can't let you down, man."

Jesse Pinkman

"Yeah, science!"

"I'm not going to be bullied into doing something"

"You either run from things or you face them, Mr. White"

"Yeah, whatever happens, happens"