The document uses the metaphor of a bank that credits your account each day with 86,400 seconds (representing the seconds in a day) to represent time. Each night any unused time is written off and lost, with no ability to carry over time to the next day. It encourages investing your time each day to get the most health, happiness, and success, as you cannot get back or draw from tomorrow's deposit of time. It emphasizes realizing the value of even small amounts of time by asking people who missed opportunities by small time periods.