Who said "A promise made is a debt unpaid; honor your word."?

This quote is attributed to Walter White.

A promise made is a debt unpaid; honor your word. - Walter White

"A promise made is a debt unpaid; honor your word."

Walter White

"I am the one who knocks."

"You asked me if I was in the meth business or the money business. Neither. I'm in the empire business."

"A man provides. And he does it even when he's not appreciated or respected or loved."

"I did it for me. I liked it."