For God is far superior to all His creation, since everything which exists has been made by God and for Him. And so, in deserting God, who is beyond compare, for the inferior works of creation, a man shows that he values God, the author of creation, less than creation itself.
From a Treatise on Charity by St. Maximus the Confessor
Anytime we make some thing the thing of primary importance in our life we have made that thing into a false god. This is true not only of bad things, such as the desire for power or money, but also good things, such as the love for a spouse. Love between spouses is a good and holy thing but once we make it more important than our love for God then it becomes for us a false god. We must be aware of this in our own lives.