Every businessman operates by two rules.
1. Take more than you need.
2. Keep it away from others except on profitable exchange.
These two rules have scriptural names. #1 is called "excess." #2 is called "extortion."
God commands that we lay not up for ourself treasures upon earth, where moth and rust doth corrupt and thieves break through and steal.
God commands that we shall give to every man that asks us.
God commands that we shall lend to all comers, even to our enemies, hoping we shall not be paid back, and not asking to be paid back.
God commands that we shall esteem our brethren as ourselves.
God commands that we shall do all things whatsoever we wish that others would do to us to others.
God commands that we shall be equal in our temporal things.
This is why you cannot serve God and mammon: everything you do in the service of mammon breaks the law and commandments of God.
And salvation is contingent upon keeping the commandments of God.