"From whence come wars and fightings among you? Come they not hence, even of your lusts that war in your members?" (James 4:1)
The good fight
Think about all the hell and trenches you went through prior to receiving Christ. All that torment, the fighting and pain and sorrow. All that stuff was effectively whisked away with your new birth. And as history is written by the victors, you now can let God create for you the life you want. Think about the things you stood for and stood by when you were "taken captive by [the devil] at his will" (2 Timothy 2:26). Now, all that stuff can be overhauled, truly yours and also backed by the power and might of the Holy Spirit. We see this. We know this. All present circumstances and misery and suffering we go through now notwithstanding, God wants to "do exceeding abundantly above all that we ask or think, according to the power that worketh in us" (Ephesians 3:20). So why, as James politely asks in the top, do we still have anything to do with the battles that sought to keep us from Christ in the first place?
Civil wars
"No man that warreth entangleth himself with the affairs of this life; that he may please him who hath chosen him to be a soldier." (2 Timothy 2:3-4)
Things like gossip and class distinction and agoraphobia (admittedly, I still have a hard times, sometimes, being in a crowded place--I don't freak out like I used to but I'm still not a hundred percent comfortable). Other things like blaming others--gender notwithstanding--for the things that God would readily supply. Things of war--the wrong kind. These are things that cause us to act in accordance with a very real enemy. One that cannot be seen with our eyes but whose thoughts and emotions can find purchase (and theater) in our heads and hearts. The outcome of which is designed to cause God's kingdom to shrink. "For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other" (Galatians 5:17) I find that forgiveness is the key. The laying down of whatever weapon we brandish to the hurt of others and ourselves. And God. Widescale amnesty has been provided through Christ. Forgiveness for all and everything. By taking part in the, uh, "bad fight" for lack of a better term, we take arms against the one who set us free to fight for Him.
"But the end of all things is at hand: be ye therefore sober, and watch unto prayer. And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins." (1 Peter 4:7-8)