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 CarrollHow puzzling all these changes are! I'm never sure what I'm going to be, from one minute to another.
Lewis CarrollIt is a very inconvenient habit of kittens (Alice had once made the remark) that whatever you say to them, they always purr.
Lewis Carroll