There's a popular phrase and a sound piece of advice floating around that sounds a little like this; "Choose your battles wisely." It's a warning and a reminder of sorts that we need to pick our battles wisely. There are sometimes we just aren't going to get anywhere much less come up with a win. It's up to us to weigh in the situation and find whether it's worth fighting for or if we simply need to let it go and keep walking.
In Matthew 5, verse 39, Jesus tells says, "Do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also." In other words, sometimes you have to take the blow and keep walking. There's a time to fight and a time to turn the other cheek.
But this isn't the end of the advice given by Jesus here in Matthew. In fact, just a few verses down in Matthew 5:44, Jesus says to "Love your enemies and pray for those who persecute you..." In the physical world around us, yes, there are battles that we must pick to fight or simply walk away from. Spiritually, in the battle between good and evil forces working behind the scenes, the battle is never an option. We are called to join at all times by joining in prayer for those we are up against.
Life happens and we may not like the way things turn out. A lot of anger comes from situations and circumstances that we have no control over. It would be easy to walk away and physically, we may need to, but spiritually we need to recognize just who is really at work here and determine to fight back with time spent on our knees in prayer. Sometimes it's not so obvious to us that Satan is moving among situations occurring in our lives, but we need to open our eyes and be aware of his attacks. We must be ready for them and choose to take action by taking it to the Lord in prayer.
There is no task, no situation, no circumstance, no person for that matter that the Lord cannot work a mighty miracle in. Praying for our enemies is praying for another chance to be a light in the life of someone who is lost or has stumbled from the path. The power of the church, the power of the believers, is prayer. "For where two or three come together in my name, there am I with them" (Matthew 18:20). Physically, choose your battles wisely. Spiritually, get up and fight through prayer for greater is He that is in us than He that is in the world (I John 4:4).