Spiritual Warfare, Hearts
In my opinion, Spiritual Warfare is in our hearts. God looks into my heart for our spiritual obedience rather than perfection. We will never be perfect as long as we live in our body. Like David's experiences, God meets us in our heart rather than our mind therefore we need to focus on the "heart of the matter". Every wrong act or practice begins with a "thought". Even though, our actions may "appear to be right" but we need to understand that Christians are always engaged in a spiritual warfare. Proverbs 4:23, it says "Above all else, guard your heart, for it affects everything you do." Spiritual maturity requires great care and a true knowledge of ourselves to distinguish a spiritual burden from irritation around us but at the same time, we cannot close our minds to everything that is happening around us. "Be very careful, then, how you live--not as unwise but as wise, making the most of every opportunity, because the days are evil." (Ephesians 5:15-16). We are to worship God from our hearts because we are the temple of the living God (2 Corinthians 6:16), that God will search us and try us, and know our thoughts.(Psalm 139:23).
God always unites and the devil always divides. It should be easy to find our way around in this confused and confusing world but sin has brought confusion. We need to focus on our spiritual warfare as Ephesians 6:12 says "For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms."
We need to realize where is our spiritual battle is. "Watch and pray that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak."--Matt. 26:41. Biblically, Christians are no longer "in the flesh": "You are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. But if anyone does not have the Spirit of Christ, he does not belong to Him" (Rom 8:9). "If Christ is in us, though the body is dead because of sin, yet the spirit is alive because of righteousness" (Romans 8:10).
Go to the source which is in our hearts. Jesus said in Matthew 6:21, "Wherever your treasure is, there your heart and thoughts will also be." (NLT) In Proverbs 4:23, "Above all else, guard your heart, for it affects everything you do." (NLT) Its not about the "flesh of the heart" but rather "spirit of the heart". Satan wants us to obey our SINFUL nature while God wants us to obey the Holy Spirit which is sealed in us. Ephesians 4:30 And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption.