I'm wondering what memento mori actually means. From Wikipedia, I see the meaning is "you must die" but that makes it sound like a threat. Legend said that one of the war prisoner use the word for mocking the Caesar.
Is there any better translation or meaning for it? Many Christian priests use it for Sunday service speech opening, to remind us that we're only mortals. So in my comprehension it means [remember that] "you/everyone will die someday". Is that correct?