A lot of great fortunes in the world have been made by owning a single wonderful business. If you understand the business, you don't need to own very many of them.
The everyday cares and duties, which men call drudgery, are the weights and counterpoises of the clock of time, giving its pendulum a true vibration and its hands a regular motion; and when they cease to hang upon its wheels, the pendulum no longer swings, the hands no longer move the clock stands still.