One of the most fundamental problems in the spiritual order is that we sense within ourselves the hunger for God, but we attempt to satisfy it with some created good that is less than God. Thomas Aquinas said that the four typical substitutes for God are wealth, pleasure, power, and honor. Sensing the void within, we attempt to fill it up with some combination of these four things, but only by emptying out the self in love can we make the space for God to fill us. The classical tradition referred to this errant desire as "concupiscence," but I believe that we could neatly express the same idea with the more contemporary term "addiction." When we try to satisfy the hunger for God with something less than God, we will naturally be frustrated, and then in our frustration, we will convince ourselves that we need more of that finite good, so we will struggle to achieve it, only to find ourselves again, necessarily, dissatisfied. At this point, a sort of spiritual panic sets in, and we can find ourselves turning obsessively around this creaturely good that can never in principle make us happy.