Carnality is often the battlefield we fight upon.

2Thess lesson #154; Every human being is born with an Old Sin Nature; it is the source of most the adversity and challenges in our life. Satan's cosmic system is designed to enflame that old nature. Understanding the battle and the importance of the filling power of the Holy Spirit is imperative. We see this in many scriptures such as, 1Corinthians 3 as well as Psalm 58.