Matthew 16:18 and 19 says,"And I also say to you that you are Peter, and on this rock I will build My church, and the gates of Hades shall not prevail against it. And I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven." To understand spiritual warfare you have to look at the human condition of sickness, worry, fear, depression, anger, abuse, and addictions etc. 1Peter 5:7-8 says,"cast all of of our cares upon Him (Jesus), for He cares for you. Be sober, be vigilant, because your adversary the devil walks about like a roaring lion, seeking whom he may devour." In John 10:10, Jesus says," The thief does not come except to steal, and to kill, and to destroy.I have come that they may have life, and that they may have it more abundantly." When we see the powers of darkness affecting our life and the lives of our familys, friends and other people, as christians, we have the authority to use the Name of Jesus to bind the powers of darkness ( the roaring lion ) and loose ourselves and others to the Holy Spirit for the help we need. The bible says that my people perish for lack of knowledge. But, because we have confessed Jesus, and belong to Him, we've been given the authority of His Name, His Blood, and His Word,To have life, and to have it more abundantly. We really need to come out of our darkness and lack of knowledge, and begin to read the bible.