Anyone, without any great penetration, may distinguish the dispositions consequent on wealth; for its possessors are insolent and overbearing, from being tainted in a certain way by the getting of their wealth. For they are affected as though they possessed every good; since wealth is a sort of standard of the worth of other things; whence every thing seems to be purchasable by it.
For a finite-size system to persist in time (to live), it must evolve in such a way that it provides easier access to the imposed currents that flow through it.
Money was established for exchange, but interest causes it to be reproduced by itself. Therefore this way of earning money is greatly in conflict with the natural law.