Time is Money–Budget It Carefully by Napoleon Hill

All of us have a single denominator in our fight for success. All of us have an equal amount of time in which to achieve it. Simple rules of health demand that eight hours of every day be spent in sleep. Eight hours more taken up in earning at least the bare necessities of life. That leaves us eight hours more of free time that can be used for whatever purpose we desire.
This is the period you can use to achieve success. Since you work so hard eight hours for the boss, why not put in a few hours more working for yourself instead of spending it idly? Benjamin Franklin once said, “Show me what a man does with his free time and I will tell you accurately whether he will be a success or failure in life.”
The man or woman who doesn’t need to hold down a regular job is doubly blessed for they have twice as much time to devote to their own ends.
Richard Monot found himself in that position. For more than a year, he spent his days in idleness and found–as so many have–that it really isn’t fun to loaf continually. Being a lover of flowers, he bought a tract of land and began growing peonies. His gardens soon became a showplace. More important, they began making more money for him than he’d ever been able to earn in his regular work-hour labors.
You should constantly try to “go the extra mile” during the period of the day the boss pays for your service. This brings promotions and pay raises. But it’s even more important that you go the extra mile for yourself during your free time. How are you spending these hours now? Do you fritter them away or do you use them to achieve success?
First, of course, you must decide upon a definite goal in life and lay out a plan for achieving it. Then use your free time to put your plan into action. Remember, whenever you waste time, you are wasting your life.
Source: Success Unlimited. August 1963. Pg. 31.