Who said "The service is only as strong as its weakest agent."?

The service is only as strong as its weakest agent. - M

"The service is only as strong as its weakest agent."

"You're not a man, Bond. You're a blunt instrument."

"I think you're still a little jealous of me, aren't you?"

"Quite successful, Bond. Your education was not wasted."

"The world is not enough."