It sounds to me like a joking retort to a motivational phrase that's gotten boring from repetition. However, it could be a way of changing it to make you "hear" it fresh--"yes, seriously, eventually it _will_ be your last day--and you might not know it." We are frequently encouraged to "live each as if it was our last." This is said so often that it has become boring and hackneyed and it can be annoying. Inspirational and motivational sayings get annoying when you hear them too often. Some people will make jokes in which the whole point is simply to surprise people by starting out in an inspirational direction and suddenly reversing course. I think the quotation is such a joke. Here's another example of a joke is just pushing back or contradicting a motivational saying: "One day, I was feeling depressed and blue because thing weren't going well. And then I suddenly heard a little voice in my head say, 'Cheer up! Things could be worse!' So I cheered up--and, sure enough, things got worse." With regard to beginning each day with fresh commitment, a few decades ago someone came up with a good variant: "Today is the first day of the rest of your life." It carries the same idea--try to see each day as a new start, don't waste it by mechanically and automatically going through the same old routine.

This is logical.

That's a quote related by Steve Jobs, not a Steve Jobs quote. :) This is a Steve Jobs quote: “When I was 17, I read a quote that went something like: 'If you live each day as if it was your last, someday you'll most certainly be right.' It made an impression on me, and since then, for the past 33 years, I have looked in the mirror every morning and asked myself: "If today were the last day of my life, would I want to do what I am about to do today?" And whenever the answer has been "No" for too many days in a row, I know I need to change something.” The quote that you and Jobs quoted is either a cynical and kind of mean-spirited definition of the concept of mortality, or it's a warning *against* living your life as if it were your last (because doing so might be so reckless that it kills you). Either way, it has nothing to do with encouraging folks to live life to the fullest, and it has nothing to do with the point that Jobs makes after quoting it. At least, that's my analysis. If there's another way to understand the quote, I'd love to know. :D

Obviously, sometime you'll live your last day. :)