that's a good one...
I'd rephrase to: never give a loan to friends and family, especially with collateral, because liquidating it will make you even more evil.
Always make others work for you and always take a credit to yourself for it.
Teach no one your tricks or they will be used against you.
Play a sucker to catch one.
Money becomes worthless as time goes on, so invest, invest, invest until you retire (don't leave too much money to your children, the will squander your fortune.)
Saved money itself does not make you happy, but it will make things easier.
Don't be too obsessive about saving, if you don't have kids. Use and spend your money to make yourself happy. Live can end at any time. And your money will not help you after you die. So use it now!
Try to spend the money only on things that make you happy! Save the rest!