You cannot have it shut and open at the same time. You must have one thing or
the other, so make up your mind which you want.

##### See also:

* 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
* You cannot serve God and mammon