Earn Nicely, spend wisely and you will live happily.
No matter what the industry you choose to ultimately invest all your time and energy in, be sure you're the owner, founder, and CEO. Remember, if you don't own it, you can't control it nor can you depend on it.
When you work on something that only has the capacity to make you 5 dollars, it does not matter how much harder you work – the most you will make is 5 dollars.
Save more than you spend, but do not hoard. Reinvest. Grow. Focus on replowing your fields so they bear fruit.
The best investment one can make with one's time is to spend it on happiness.