On a slight tangent, you know the old saying - "A lawyer / doctor has a fool for a client if he represents / treats himself"? Someone told me the businessman /

On a slight tangent, you know the old saying - "A lawyer / doctor has a fool for a client if he represents / treats himself"? Someone told me the businessman / entrepreneur equivalent of this is - "A man who does business with his own money is a fool. A man who does not know how to do business with other people's money is no business man." (It's not really a black and white thing, but it is wise advise - the ability to raise funds at the start, and to ensure your business survival, is a very necessary talent that anyone venturing into a business needs to have.)