A strong physical core requires engaging those muscles, strengthening exercises, and a healthy diet to rid your body of excess weight. In the same way, to have a strong spiritual core, we have to be mindful to engage it, exercise it, and expel lies.
We have to cast down imaginations (2Cor. 10:5), and think on things that are true (Phil. 4:8), to be sober. The more we do that, the more mature we are in Christ, and the stronger we will stand against the world, flesh, and devil, and have spiritual stability. Addiction: the fact or condition of being addicted to a particular substance, thing, or activity.