A lot of people use the “live every day like there’s no tomorrow” but really, you can’t. Some days you just have to work and go to the doctor’s or something and if the next day is the last then you’ll be pissed. I like Steve Jobs “tweak” on it. Nothin revolutionnary but the original phrase is more usable that way. (Emphasis mine)
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.
Part of the commencement address he gave at Stanford.