“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.”
Simple: Every morning, I ask 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 is “No”, then I know I need to change something.

Steve Jobs, Founder of Apple Computers Inc.