Luke 16:13

“No servant can serve two masters, for either he will hate the one, and love the other, or else he will hold to one, and despise the other. You cannot serve God and mammon.”

Jesus then caps His arguments with a final statement. All this is true because no one can serve two masters. Anyone who has two masters will not be able to serve them in balance. Always one must take precedence. Thus every man must choose Who or what will be his real master. It is not possible to serve God and Wealth at the same time. One will always be loved more than the other. One will be clung to and the other despised. Thus how we use the wealth entrusted to us actually brings out who is in control. It brings out whom or what we serve, just as the estate manager had served his own interests and not his lord's.

Thus if we only use our worldly wealth under the direction of God, with no regard for it but as a tool to be used as God wills, then well. But if we allow it to deflect us from doing and being the very best for God, then it will have taken over the mastership, and our commitment will necessarily suffer. Whatever our protestations we are declaring that wealth is our master. We are treating God as though He were less important than possessions. We are thus despising God. That is what Jesus observed in the rich young ruler and why He made such a total demand on him. He knew that wealth had too much of a hold on him, as indeed his final decision proved. He loved wealth rather than God. He was exactly like the estate manager!