Mammon is the god of riches. You must choose between godliness and
worldliness. The source is Matthew, vi, 24, which is quoted under No man can
serve two masters.

##### See also:

* A door must be either shut or open
* No man can serve two masters
* You cannot burn the candle at both ends
* You cannot have it both ways
* You cannot have your cake and eat it
* You cannot run with the hare and hunt with the hounds
* You cannot sell the cow and drink the milk