Answer: Everything depends on how money is used. If I want to fulfill my egoism, then I need money. But if I want to use my egoism to fulfill others, then I need an anti-egoistic screen, a “covering” for egoism such as money.
Money is an indicator of my power, the force of the screen. Thus, wars aren’t fought because of money, but because of egoism.
Besides, you can’t buy everything with money, although you can buy almost everything. Even in our world there are qualities relating to the root of the soul which cannot be bought, such as a special connection between people or a special aptitude that comes from the root of the soul (such as talent in music, art, or literature).
Qualities that we receive from nature cannot be bought with money. The things we have to add ourselves with our efforts, including the relationships between people and love, are also very difficult to buy.
Sometimes we confuse money with efforts. But it is impossible to simply pay and buy a certain attitude. The things belonging to nature, which we receive from the Creator and have to return to Him, are impossible to conquer egoistically, and our paper money also won’t help here.
From the 4th part of the Daily Kabbalah Lesson 3/1/11, Lesson on Money