Live and Let Die, with nuclear-hot Jane Seymour.
“Before you go, do we have time for Lesson Number Three?”
“Absolutely. There’s no sense going off half-cocked.”
It would. And Sam would never stoop to a Bond one-liner.
Another favorite (I think from Live and Let Die):
Bond makes M a cup of espresso. (This was in the mid 1970’s, when most people in the English-speaking world had never heard of espresso.) Bond goes through the whole ritual of grinding, steaming, etc., etc., etc. M looks at the espresso machine, looks at the cup of coffee, and says “Is that all it does?”
Not so much a one-liner, but the scene where Brosnan as Bond smashes up a city driving a tank, then stops and adjusts his tie. Quintessential JB! See here at 4:42.