'The one who earned and used what he has earned, has gained. The one who earned and collected, and departed, has lost," says Sa'di. We learn from this that it is not only important to earn money, it is of greater importance to know how to use it. There are many in this world who possess wealth and yet are unhappy; they cannot profit by it themselves, nor can they benefit anyone else. The one who earns money and keeps it in the safe is not the possessor of that money; he is the doorkeeper of his treasure.