If doubtful whether to end with "yours faithfully," or "yours truly," or "yours most truly," &c. (there are at least a dozen varieties, before you reach "yours affectionately"), refer to your correspondent's last letter, and make your winding-up at least as friendly as his: in fact, even if a shade more friendly, it will do no harm!
Lewis CarrollMad Hatter: โWhy is a raven like a writing-desk?โ โHave you guessed the riddle yet?โ the Hatter said, turning to Alice again. โNo, I give it up,โ Alice replied: โWhatโs the answer?โ โI havenโt the slightest idea,โ said the Hatter
Lewis CarrollWould you tell me, please, which way I ought to go from here?" "That depends a good deal on where you want to get to." "I don't much care where โ" "Then it doesn't matter which way you go.
Lewis Carroll