“That'll do”

“Don't do anything I wouldn't do, if you ever find anything I wouldn't do.”

“Do unto others before they do unto you.”

“Learnin’ how not to do things is as hard as learning how to do them.”

“It's not worth doing something unless someone, somewhere, would much rather you weren't doing it.”

“When Mr. Aching had worked for the old Baron, they had, as men of the world, reached a sensible arrangement, which was that Mr. Aching would do whatever the Baron asked him to do. Provided the Baron asked Mr. Aching to do what Mr. Aching wanted to do and it needed to be done.”

“Them as can do has to do for them as can't. And someone has to speak up for them as has no voices.”