This is a phrase that confuses a lot of us. Here is a nice article from Already Not Yet..
J.D. Greear: Many people think that if Jesus paid it all, we now have this divine Visa card with an unlimited balance. We can just flash it whenever we want to cover whatever sin we choose. And as the Apostle Paul anticipated, some people will even justify their actions by saying, “Hey, if God gets more glory […
Averagechristiannet 