Who said "What I do now, I do for me."?

This quote is attributed to Walter White.

What I do now, I do for me. - Walter White

"What I do now, I do for me."

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."